"Amazon price tracker" means something different depending on who is asking. A shopper wants to know whether today's price is a good deal. A seller has three separate tracking problems, and confusing them is how sellers end up with a dashboard full of numbers and no idea what to do.
The three problems are: what competitors charge, what your suppliers charge you, and what you charged, when, and why.
Problem 1: Competitor Price Tracking
The visible one. Other sellers on your listings change price, and every change either creates an opportunity or costs you the Buy Box.
What to track per ASIN: the current Buy Box price and who holds it, the lowest FBA offer, the lowest FBM offer, total offer count, and each competitor's fulfillment method.
That last field matters more than beginners expect. The Buy Box weights fulfillment heavily, so an FBA offer can hold the box at a price meaningfully above the lowest FBM offer. Tracking only "lowest price" leads you to chase offers that were never actually beating you. How the Buy Box algorithm works covers why.
How often: on actively contested listings, minutes. On a listing with three stable sellers, hourly is fine. Polling faster than the market moves adds cost and no information.
What to do with it: almost nothing manually. Competitor price data is only valuable connected to a rule that acts on it. A dashboard you check twice a day cannot beat a competitor's repricer that reacts in seconds. This is the entire argument for automated repricing.
Problem 2: Supplier Price Tracking
The one that actually costs money, and the one almost nobody does.
If you source from retailers or wholesalers — online arbitrage, wholesale, or dropshipping — your cost is not a fixed number. It is whatever your supplier charges today. And when that number moves, nothing on Amazon tells you.
Consider the sequence:
- You source a product at 18 dollars and set a floor of 26 dollars to protect your margin.
- Six weeks later the supplier's promotion ends and the price is 22 dollars.
- Your floor is still 26. Your margin has silently dropped by more than half.
- Your repricer, obeying its instructions perfectly, keeps selling at 26.
Nothing broke. No alert fired. Your Amazon reports show the same revenue they always did. You find out when you reconcile the month, or when you do not find out at all.
What to track: the supplier's current price, their stock status, and the date of the last change — per product, per supplier.
Why it is harder: competitor prices come from Amazon's API. Supplier prices come from 40 different retailer websites, each with its own structure, each of which changes without warning, several of which actively resist automated access. This is why most repricing tools stop at Amazon data.
Repricefy monitors supplier product pages across more than 40 retailers and pushes the change through to the listings that depend on it — the cost basis updates, the floor derived from it moves, and the repricer starts working within the corrected boundary. See supplier monitoring and Why Supplier Price Monitoring Is Critical.
Problem 3: Your Own Price History
The one people only miss when they need it.
A listing stops selling. You want to know: what was my price last Tuesday, what did the repricer do, and why. Amazon does not keep a usable per-listing price history for sellers, so if your tooling does not log it, that question has no answer.
What a useful price log records:
- Every price change, with a timestamp
- The competitive landscape that triggered it
- The strategy or rule that produced the decision
- Any decision that was blocked — a proposed price rejected because it fell below your floor
That last one is the most diagnostic entry in the whole log. A listing showing dozens of blocked changes is telling you something specific: the market has moved below your cost. Not a bug, not a tooling failure — a sourcing problem. Either your supplier cost has to come down or that product should be discontinued.
Without the log, the same situation presents as "the repricer stopped working," and you spend a day debugging software that is behaving exactly as designed.
Stock Tracking Belongs Here Too
Price and availability are the same monitoring job, and availability is the more urgent half.
When a supplier goes out of stock, your Amazon listing does not know and keeps taking orders. Every one you cannot fulfill becomes a cancellation defect, and cancellation rate is an account health metric that gets sellers suspended. See What Happens When You Go Out of Stock.
The response has to be automatic, because the window is measured in hours. Repricefy sets the quantity to zero on MFN listings when a monitored supplier marks a product unavailable — before the unfillable order arrives, not after. FBA quantity is Amazon's to manage, so it is left alone.
Tracking Is Not the Goal
The trap in this whole topic is building visibility and calling it a solution. A tracker that emails you at 3am about a price change is a tracker that tells you, at 9am, about six hours of lost sales.
Tracking earns its keep only when it is wired to an action:
- Competitor price moves → repricer adjusts within your floor and ceiling
- Supplier price moves → cost basis and floor update automatically
- Supplier goes out of stock → listing quantity goes to zero
- Proposed price below floor → change blocked and logged for review
Each of those is a closed loop that runs whether or not you are watching. That is the actual deliverable. The dashboard is just how you audit it afterwards.
Frequently Asked Questions
What is the best Amazon price tracker for sellers?
Consumer price trackers show historical prices on a product page, which is useful for research but not for operations. Sellers need a tracker connected to their own listings and costs so that a detected change can trigger a repricing or stock action rather than an email.
How often should I track competitor prices?
Frequently enough to respond before a change costs you Buy Box share, which on active listings means minutes. On slow listings with two or three stable sellers, hourly is entirely adequate.
Can I track Amazon prices for free?
Free consumer trackers cover historical pricing on individual ASINs. Seller-side tracking that connects competitor prices, supplier costs, and your own listings is what repricing platforms provide, and Repricefy includes it free for up to 25 listings.
Why does supplier price tracking matter more than competitor tracking?
A competitor price change costs you sales until you react. A supplier price change costs you money on every sale you make and is invisible in Amazon's reporting, so it can run for weeks before anyone notices.
How do I track my own Amazon price history?
Amazon does not retain a usable per-listing price history for sellers, so you need your repricing tool to log every price change with the reason for it. Without that log you cannot diagnose why a listing stopped selling.
Repricefy tracks competitor offers and supplier pages, and acts on both. Free for your first 25 listings. Start free.