In a competitive B2B market, inventory is a strategic asset that directly impacts cash flow, customer satisfaction, and profitability. Mismanaging this asset leads to tied-up capital in slow-moving goods, lost sales from stockouts, and margin erosion from excess holding costs. For founders, ecommerce managers, and sales leaders, mastering inventory means making data-driven decisions that balance supply with demand and respond proactively to market shifts.
Effective inventory management isn't a passive, background operation. It's an active discipline that requires a sharp focus on real-time data and market dynamics. For instance, knowing when a competitor drops their price on a key product allows you to adjust your own stock levels and pricing strategy, preventing overstock situations or missed sales opportunities. This proactive approach turns inventory from a reactive cost center into a powerful driver of commercial success.
This article moves beyond abstract theory to provide a prioritized, actionable collection of inventory management best practices. We will break down ten essential strategies, from demand forecasting and ABC analysis to competitive price monitoring and supplier collaboration. Each point includes concrete implementation steps and real-world examples, giving you a clear roadmap to optimize your operations. You will learn how to ensure you have the right product, at the right time, and at the right price, strengthening your competitive edge and boosting your bottom line.
1. Real-Time Inventory Visibility and Tracking
At its core, real-time inventory visibility means having an accurate, up-to-the-minute view of your stock across every warehouse, sales channel, and physical location. This practice moves beyond periodic manual counts and spreadsheet updates, replacing them with a live, dynamic system that tracks inventory movements as they happen. For distributors and online retailers, this immediate access to data is foundational to modern commerce, preventing lost sales from stockouts and eliminating the capital drain of overstocked items.

The commercial impact is direct: you can confidently promise delivery times, avoid overselling popular products, and make smarter purchasing decisions. For instance, a distributor using an ERP can see that a specific SKU is running low in their main warehouse but is fully stocked in a secondary location, allowing them to fulfill an urgent B2B order by rerouting the shipment instead of back-ordering. Similarly, an ecommerce brand syncing inventory across their webstore, Amazon, and a physical pop-up shop avoids canceling orders and damaging their brand reputation. This granular control is a key component of effective inventory management best practices.
How to Implement Real-Time Tracking
To put this into action, focus on integrating your core business platforms. Connect your warehouse management system (WMS), enterprise resource planning (ERP), and point-of-sale (POS) systems to a central inventory management platform. This unified view ensures that a sale on any channel immediately updates the available stock count everywhere else.
- Set Automated Reorder Points: Configure your system to automatically trigger purchase orders when a SKU’s quantity hits a predetermined minimum threshold. This prevents stockouts before they occur.
- Identify Slow-Moving Stock: Use live data to pinpoint products with low velocity. This insight allows you to create targeted promotions or bundle deals to clear out stagnant inventory, directly improving your cash flow.
- Integrate with Pricing Tools: Connect your inventory system to a competitive pricing tool. This allows for dynamic pricing strategies, such as slightly increasing prices on low-stock, high-demand items or discounting products that are overstocked.
- Verify with Cycle Counts: While automation is key, regular physical cycle counts remain important to confirm system accuracy and identify issues like theft or damage. This verification loop builds confidence in your data and helps you better calculate key metrics, as detailed in this guide to the inventory turnover ratio.
2. ABC Analysis and SKU Rationalization
Not all inventory items are created equal, and managing them as if they are is a significant drain on resources. ABC analysis is a classification technique that segments your inventory into three categories based on the Pareto principle: A-items are your most valuable products, B-items are moderately valuable, and C-items are the least valuable. This stratification allows businesses to apply different management policies to each category, focusing the most rigorous control on the SKUs that generate the most revenue.
This method is crucial for distributors, manufacturers, or retailers managing thousands of SKUs. It provides a logical framework for prioritizing attention, capital, and labor. For instance, an electronics manufacturer can use ABC analysis to apply strict MAP monitoring and competitive tracking on its flagship "A" products, while managing its lower-margin "C" accessory items with more automated rules. This focused approach is one of the most effective inventory management best practices for optimizing cash flow and service levels simultaneously.
How to Implement ABC Analysis
To begin, you must calculate the annual consumption value for each inventory item (Annual Demand x Item Cost). Rank the items from highest to lowest value, then group them into A, B, and C categories. Typically, A-items represent the top 20% of items contributing to 80% of value, B-items the next 30% contributing to 15% of value, and C-items the bottom 50% contributing to just 5% of value.
- Set Different Service Level Targets: Apply the tightest controls and highest service level targets (e.g., 99%) to your A-items. B-items can have a moderate target (e.g., 95%), while C-items can have a lower one (e.g., 90%), allowing for more efficient use of safety stock.
- Align with Pricing and Monitoring Strategy: Your A-items have the biggest impact on your bottom line and brand perception. Automated solutions like Market Edge are ideal for closely monitoring competitor pricing and stock levels for this high-value category, while B and C-items can be monitored less frequently.
- Run Analysis Regularly: Customer demand, seasonality, and market trends change. Conduct an ABC analysis quarterly or semi-annually to ensure your classifications remain accurate and reflect current business realities. An item could shift from category C to A in a matter of months.
- Combine with Other Metrics: Enrich your analysis by layering in other data points. A high-volume A-item with a razor-thin margin might warrant less strategic attention than a lower-volume B-item that delivers significant profit with every sale. This leads to more intelligent SKU rationalization and portfolio decisions.
3. Just-In-Time (JIT) Inventory Management
Just-In-Time inventory is a lean strategy where products are ordered and received only when they are needed for production or direct sale. This approach minimizes holding costs, reduces waste, and improves cash flow by keeping on-hand stock to an absolute minimum. Rather than stockpiling goods in anticipation of future demand, JIT relies on precise forecasting and highly coordinated supply chain activities to ensure materials arrive at the exact moment they are required.
The commercial benefit is significant: capital that would otherwise be tied up in stagnant inventory is freed for other business priorities. For example, a fast-fashion brand's model may be built on a JIT foundation, with stores receiving new inventory twice a week based on immediate sales data, preventing outdated stock. Similarly, a build-to-order computer manufacturer minimizes the cost and risk of holding component inventory that could quickly become obsolete. This makes JIT a powerful inventory management best practice for businesses aiming for maximum efficiency.
How to Implement Just-In-Time Inventory
Successful JIT implementation depends on data accuracy and strong supplier partnerships. You must have confidence in your demand forecasts and trust that your suppliers can deliver on tight schedules without fail.
- Establish Reliable Supplier Agreements: Work with your key suppliers to create agreements that guarantee short lead times and flexible delivery schedules. The reliability of these partners is the cornerstone of any JIT system.
- Implement Accurate Demand Forecasting: Use forecasting tools to predict sales with a high degree of accuracy, typically within a 2-to-4-week window. This precision is critical for timing your purchase orders correctly.
- Start with A-Category Items: Begin your JIT strategy with your fastest-moving, highest-value products (your "A" items from an ABC analysis). Their predictable demand makes them ideal candidates for testing and refining your JIT process before expanding it.
- Monitor Competitor Stock Levels: Use a monitoring tool to track competitor inventory. If you see a key competitor is running low on a popular item you also sell, you can anticipate a temporary demand spike and adjust your safety stock or orders accordingly, preventing stockouts.
4. Competitive Price Monitoring and Dynamic Pricing Optimization
Effective inventory management isn't just about internal stock levels; it's also about how your products perform in the external market. Competitive price monitoring involves continuously tracking competitor pricing across all channels and using that intelligence to adjust your own prices. This practice connects external market data with internal inventory data, allowing you to make pricing decisions that maintain competitiveness, protect margins, and optimize revenue. For distributors and retailers in transparent, price-sensitive markets, this is a critical defensive and offensive strategy.
The commercial impact is immediate and significant. By knowing how your rivals are priced, you can avoid being undercut on key products or, conversely, leaving money on the table when you have a market advantage. For example, a distributor using a price monitoring tool can see that a competitor just went out of stock on a popular item and can strategically raise their price slightly to improve margin without losing sales momentum. Similarly, a brand can use this data to enforce its MAP policy, ensuring unauthorized discounters aren't eroding brand value and creating channel conflict with its retail partners.
How to Implement Price Monitoring and Dynamic Pricing
To put this into action, you need a system for gathering market intelligence and a set of rules to act on it. This moves pricing from a manual, reactive task to an automated, strategic function that supports your inventory goals.
- Set Price Floors and Ceilings: Before automating anything, establish clear price boundaries for each SKU. Your floor should be based on your cost of goods sold (COGS) plus your minimum acceptable margin, not just what a competitor is doing. This prevents margin erosion during price wars.
- Create Rule-Based Pricing Logic: Configure pricing rules that consider both competitor prices and your inventory levels. For instance, you could set a rule to aggressively match the lowest price on an overstocked item but only adjust pricing on a low-stock, high-demand product if the competitor's price is within 5% of your target.
- Segment Your Monitoring Frequency: Not all products require the same level of attention. Monitor your "A" items (high-value, fast-moving) daily, your "B" items weekly, and your "C" items monthly. This approach, which ties into the ABC analysis discussed earlier, focuses your resources where they have the most impact on profitability.
- Integrate Price and Stock Intelligence: A key element of modern inventory management best practices is the integration of data. Tools that monitor both price and stock availability, like Market Edge, provide a complete picture. Seeing that a competitor is not only cheaper but also has deep stock requires a different response than if they are cheaper but have only five units left.
5. Demand Forecasting and Predictive Analytics
Effective inventory management hinges on buying the right amount of product at the right time. Demand forecasting moves past simple guesswork by using historical sales data, market trends, and predictive analytics to project future customer demand with greater accuracy. This forward-looking approach is critical for minimizing capital tied up in slow-moving goods while preventing lost sales from stockouts. It's especially valuable for distributors managing seasonal products or online retailers dealing with items that have unpredictable demand patterns.
The commercial impact is substantial: accurate forecasts directly inform purchasing, pricing, and promotional strategies. For example, a CPG company uses advanced forecasting to optimize its global supply chain, ensuring product availability while keeping carrying costs low. Similarly, an ecommerce merchant can integrate forecasting tools to automatically adjust inventory plans for an upcoming holiday season, preventing overselling on Black Friday and ensuring they don't have excess stock come January. This foresight is a cornerstone of strategic inventory management best practices.
How to Implement Demand Forecasting
Start by analyzing your historical sales data and then layer in external factors. Connect your sales channels and inventory platform to a forecasting tool or use the native capabilities within your ERP to generate initial projections. The goal is to create a reliable baseline you can refine over time.
- Segment Your Forecasts: Don't apply a one-size-fits-all model. Create distinct forecasts based on product category, seasonality, sales channel, or customer type for significantly higher accuracy.
- Start with Simpler Models: Before diving into machine learning, implement foundational methods like moving averages or exponential smoothing. These provide a solid starting point and help you understand your data's patterns.
- Incorporate Competitor Data: Use market intelligence to inform your demand models. For instance, data from a tool like Market Edge showing a key competitor’s significant price drop on a related product can signal an imminent shift in market demand, allowing you to adjust your forecast proactively.
- Review and Refine: Forecasts are never perfect. Schedule a monthly review to compare your projections against actual sales. This feedback loop allows you to adjust your models and improve their accuracy, building confidence in your purchasing decisions. You can learn more about how advanced models work by reading this guide to machine learning for retail.
6. Supplier Relationship Management and Vendor Consolidation
Effective inventory management extends beyond your warehouse walls; it begins with your suppliers. This practice focuses on building strategic, long-term partnerships with key vendors while consolidating your overall supplier base. Instead of treating procurement as a purely transactional activity, you cultivate relationships that yield better lead times, consistent quality, preferential pricing, and greater supply chain resilience. For manufacturers and importers, reducing the number of suppliers simplifies logistics, cuts administrative overhead, and often unlocks volume discounts.
The commercial benefit is a more predictable and cost-effective supply chain. Consider a large retailer's use of supplier scorecards to drive continuous improvement, ensuring its shelves are stocked with quality products at low prices. Similarly, a distributor that consolidates its orders for a specific product category with one primary supplier can negotiate a 10% volume discount, directly improving its gross margin. This strategic approach to sourcing is a core element of the best practices for inventory management because it creates a competitive advantage that is difficult for rivals to replicate.
How to Implement Supplier Management and Consolidation
Begin by analyzing your current supplier list and categorizing them based on their strategic importance to your business. This allows you to focus your relationship-building efforts where they will have the most significant impact on your inventory and profitability.
- Classify Your Suppliers: Tier your vendors into groups such as strategic (for A-list, critical items), preferred (for B-list, important items), and transactional (for C-list, commodity items). Allocate your time and resources accordingly.
- Establish Performance Metrics: Create clear key performance indicators (KPIs) for your top suppliers, tracking on-time delivery rates, order accuracy, and quality defect rates. Hold quarterly business reviews with your top 20% of vendors to discuss performance.
- Consolidate Spending: Identify opportunities to reduce the number of vendors you use for similar items. This increases your purchasing power with the remaining suppliers and simplifies your procurement process.
- Maintain Backup Options: While consolidating, always maintain relationships with two to three qualified backup suppliers for your most critical inventory items. This ensures business continuity if your primary supplier faces a disruption. A deep understanding of how to negotiate with suppliers is fundamental to building these flexible and resilient relationships.
7. Warehouse and Storage Optimization
Effective inventory management extends beyond data and software; it requires a physically optimized environment. Warehouse and storage optimization involves strategically designing your facility’s layout, implementing efficient storage systems, and applying organizational methods to maximize space, reduce order picking time, and improve overall operational flow. For distributors and large retailers, where warehouse costs represent a significant operational expense, a well-organized facility directly impacts profitability and fulfillment speed.

The commercial impact is substantial: faster picking and packing means quicker order fulfillment, which improves customer satisfaction and allows you to process more orders daily. For example, a distributor can use cross-docking for high-velocity items, moving them directly from receiving to shipping without ever placing them into long-term storage. This drastically reduces handling time and warehouse costs. Similarly, e-commerce brands can use AI-powered systems to place frequently bundled items near each other, cutting down the travel time for pickers and accelerating the entire fulfillment process. These physical efficiencies are a core component of the best practices for inventory management.
How to Implement Warehouse and Storage Optimization
Begin by analyzing your current product mix and sales velocity. A warehouse layout should not be static; it must evolve with your business. Integrate your warehouse management system (WMS) with your inventory data to make informed decisions about product placement and workflow.
- Apply ABC Analysis to Zoning: Map your ABC inventory classification directly to your warehouse layout. Place your high-value, fast-moving "A" items in easily accessible zones near packing stations to minimize travel time for your most frequent picks.
- Implement a Clear Rotation System: Use First-In, First-Out (FIFO) for perishable goods or items with a limited shelf life to prevent spoilage and waste. For non-perishable items, Last-In, First-Out (LIFO) can sometimes be used for tax advantages, but FIFO is generally the standard for ensuring product freshness.
- Utilize Vertical Space: Maximize your storage capacity by installing taller shelving and racking systems. This is often one of the most cost-effective ways to increase your warehouse’s holding capacity without expanding its physical footprint.
- Adopt Cross-Docking for High-Velocity Goods: For products that move quickly from supplier to customer, set up a cross-docking area. This allows you to bypass storage altogether, reducing warehousing time and labor costs for your most popular items.
8. Inventory Accuracy and Cycle Counting
Inventory accuracy is the bedrock upon which all other management practices are built. It involves replacing the disruptive annual physical inventory with a systematic process of cycle counting-regularly counting small subsets of inventory. This approach ensures your records are consistently precise, preventing the financial drains of overstocking, the lost sales from phantom stockouts, and the misallocation of capital based on faulty data. For any business, from distributors to retailers, this accuracy enables confident decision-making.

The commercial benefit is undeniable. High inventory accuracy, often exceeding 99% in top-performing companies, directly translates to better fulfillment rates and higher customer satisfaction. Consider a pharmaceutical distributor, where precise counts are not just a best practice but a compliance mandate. Similarly, an e-commerce fulfillment network’s continuous inventory verification allows it to operate with extreme efficiency. Maintaining accurate records is a fundamental part of the best practices for inventory management, ensuring that what your system says you have is what is actually on the shelf.
How to Implement Cycle Counting and Improve Accuracy
Transitioning from annual counts to a continuous cycle counting program requires a structured, data-driven methodology. This shift turns inventory validation into a routine operational task rather than a once-a-year disruption. It provides immediate feedback on system health and process integrity.
- Segment Inventory for Counting: Apply the ABC analysis method. Count high-value A-items frequently (daily or weekly), B-items less often (monthly), and low-value C-items quarterly. This focuses your effort where it has the most financial impact.
- Use Barcode Scanning: Eliminate manual entry errors by equipping your team with barcode scanners. This simple technology dramatically improves the speed and precision of counts, reducing human error.
- Investigate Variances Promptly: Set a threshold for acceptable discrepancies, such as 2% of unit value. When a variance exceeds this, investigate the root cause immediately. This helps identify systemic issues like receiving errors, misplaced stock, or potential theft.
- Train Your Team: Proper counting and documentation procedures are critical. Provide clear training to ensure every team member understands the process, the tools, and the importance of their role in maintaining data integrity.
9. Safety Stock and Service Level Management
This practice involves creating a strategic inventory buffer (safety stock) to insulate your business from demand spikes and supply chain disruptions. It moves beyond simple reordering by tying inventory levels directly to service level targets, which define your commitment to fulfilling customer orders on time. A higher service level (e.g., 98%) means you aim to fulfill 98% of orders without a stockout, but it requires holding more safety stock and incurring higher carrying costs. This creates a critical trade-off between the risk of lost sales and the cost of holding excess inventory.
The commercial impact is significant. For distributors handling critical B2B components, a high service level prevents line-down situations for their customers, justifying the cost of higher safety stock. Conversely, an online retailer can set a lower service level for slow-moving C-items, accepting a minor stockout risk to free up capital for high-demand A-items. This calculated approach is a cornerstone of profitable and resilient inventory management best practices.
How to Implement Safety Stock and Service Levels
Begin by classifying your products (e.g., using ABC analysis) to assign appropriate service level targets. High-priority "A" items warrant higher targets, while low-priority "C" items can have lower ones. Use statistical formulas to calculate the necessary buffer for each product or category based on its demand and lead time variability.
- Calculate Safety Stock Quantities: A standard formula is: Safety Stock = (Maximum Daily Sales × Maximum Lead Time) – (Average Daily Sales × Average Lead Time). This calculation provides a data-driven baseline for your inventory buffer.
- Set Tiered Service Levels: Apply higher service levels (e.g., 97-99%) to your most profitable or MAP-enforced products to protect brand reputation and high-value sales. Use lower targets (e.g., 85-90%) for less critical C-items.
- Monitor Stockout Incidents: Track stockouts monthly to validate your targets. A high frequency of stockouts for a particular SKU signals that your safety stock level or service level target is too low and needs adjustment.
- Use Market Data as a Leading Indicator: Monitor competitor stock levels for related products. If competitors are running low, it suggests market-wide demand is rising. This is a cue to proactively increase your safety stock temporarily to capture that excess demand before a stockout occurs.
10. Obsolescence Management and Inventory Markdown Strategy
Obsolescence management is the practice of proactively identifying, managing, and clearing out inventory that is unlikely to sell at full price. This obsolete stock, also known as dead or excess inventory, includes slow-moving, discontinued, damaged, or expired seasonal items that tie up valuable capital and consume warehouse space. A strategic markdown plan is essential for recovering value from these assets before they become a total loss.
The commercial impact of ignoring obsolete stock is significant. It inflates holding costs, skews inventory valuation, and prevents investment in profitable, high-velocity products. For example, a tech distributor must aggressively discount older smartphone models as new ones are released to avoid being left with worthless inventory. Likewise, grocery stores use markdown labels on items approaching their expiration dates to generate some revenue instead of incurring a complete loss. An effective markdown strategy turns a potential liability into a cash flow opportunity, making it one of the most critical best practices for inventory management.
How to Implement an Obsolescence and Markdown Strategy
Success depends on a structured, data-driven approach to both prevention and liquidation. The goal is to minimize the creation of obsolete stock in the first place while having a clear plan for when it inevitably occurs.
- Run Monthly Aging Reports: Analyze your inventory aging data to identify any SKUs that have shown little to no sales activity in the last 90 days. This is your primary candidate list for review and potential markdowns.
- Create a Tiered Markdown Schedule: Plan your price reductions in stages to maximize recovery. For example, implement a schedule of 15% off in week one, 30% in week two, and 50% in week three, before moving the remaining units to a final clearance channel.
- Monitor Competitor Pricing: During a markdown event, you are competing against other retailers' clearance efforts. Use a tool to monitor competitor prices on similar items. If rivals are also discounting heavily, you may need to accelerate your markdown schedule to capture customer attention and move units faster.
- Set Recovery Targets: Don’t discount arbitrarily. Establish a goal for your markdown strategy, such as recovering at least 40-50% of the item’s original cost. This provides a clear financial benchmark for the campaign's success.
- Limit Markdown Frequency: Avoid conditioning your customers to wait for a sale. Constant discounting can damage brand perception and erode profit margins on future full-price sales. Reserve major markdown events for specific, planned periods like end-of-season or end-of-life cycles.
Actionable Takeaway Checklist
Use this checklist to self-assess your current inventory management practices and identify immediate areas for improvement.
Data & Analytics
- Real-Time Visibility: Is our inventory data updated in real-time across all sales channels?
- ABC Analysis: Have we classified our SKUs by value (A, B, C) within the last six months?
- Demand Forecasting: Do we use historical data and market trends to forecast demand, not just guesswork?
- Aging Reports: Do we regularly review inventory aging reports to identify slow-moving stock?
Market Intelligence
- Price Monitoring: Are we actively tracking key competitor prices for our "A" items?
- Stock Monitoring: Do we know when key competitors go out of stock on important products?
- MAP/RRP Enforcement: For brands, are we monitoring online channels for pricing policy violations?
Operations & Strategy
- Cycle Counting: Do we have a regular cycle counting program in place instead of relying only on annual counts?
- Safety Stock: Are our safety stock levels calculated based on data and service level targets?
- Supplier Performance: Do we track KPIs (e.g., on-time delivery) for our most critical suppliers?
From Practice to Profit: Integrating Your Inventory Strategy
Moving through this detailed examination of inventory management best practices, a central theme emerges: individual tactics, while useful, achieve their full potential only when woven into a cohesive, integrated strategy. Effective inventory control is not a checklist to be completed; it is a dynamic, interconnected system where each part strengthens the whole. Your goal is to build an operational flywheel where improvements in one area create positive momentum in another, ultimately driving profitability and competitive resilience.
Think of it as a series of connected gears. Precise cycle counting and a commitment to inventory accuracy (Practice #8) provide the reliable data foundation needed for all other functions. Without knowing exactly what you have and where it is, any attempt at sophisticated management is built on sand. This accuracy directly feeds into the precision of your demand forecasting (Practice #5), allowing your predictive analytics to generate trustworthy projections instead of educated guesses.
With a confident forecast in hand, you can then implement more advanced techniques with lower risk. You can fine-tune your safety stock and service levels (Practice #9) to protect against variability without tying up excessive capital. This enables a more aggressive and efficient ABC analysis and SKU rationalization program (Practice #2), ensuring your most valuable resources are dedicated to your most profitable products. It even makes advanced methods like Just-In-Time (JIT) (Practice #3) a viable reality rather than a high-stakes gamble.
The External Link: Where Market Intelligence Meets Inventory
However, even a perfectly tuned internal inventory system can fail if it operates in a vacuum. This is where the crucial, often-overlooked external context comes into play. Practices like competitive price monitoring (Practice #4) and supplier relationship management (Practice #6) are not just add-ons; they are the bridge between your internal operations and the external market realities that dictate your success.
Knowing your competitors’ stock levels and pricing strategies provides a critical validation layer for your own decisions.
- Are you holding too much safety stock for a product a competitor is about to heavily discount?
- Is a key supplier offering better terms to a rival, impacting their cost of goods and retail price?
- Are unauthorized sellers violating your MAP policy, creating channel conflict and devaluing your brand, which in turn distorts demand signals?
This is where your internal data meets external intelligence. Integrating real-time market data allows you to connect your inventory position directly to your pricing strategy, promotional planning, and even your supplier negotiations. For manufacturers and brands, this external visibility is essential for enforcing MAP/RRP policies, protecting brand equity, and ensuring a level playing field for your distribution partners. For retailers and distributors, it’s the key to identifying pricing opportunities, avoiding overstock on uncompetitive items, and making smarter purchasing decisions. The most effective best practices for inventory management are those that are informed by the market.
Ultimately, mastering inventory is about transforming a cost center into a strategic asset. It’s about more than just reducing carrying costs or preventing stockouts. It is about creating a nimble, responsive supply chain that can adapt to market shifts, capitalize on opportunities, and deliver a superior customer experience. By methodically implementing and, more importantly, integrating these ten practices, you move from simply managing stock to strategically directing capital, maximizing profit margins, and building a durable competitive advantage.
This is where automated price monitoring tools like Market Edge become useful.