An Amazon price tracker built for eBay sellers
Last updated 26 October 2026
An Amazon price tracker for eBay sellers watches the Amazon products behind your eBay listings and reacts when the price or the stock changes. Dropizon reads each product in a real Chrome tab on your own computer, at the delivery postcode you choose, decides which listings need a reading most, and updates the eBay price and quantity from what it finds.
How does Dropizon read an Amazon price?
The Dropizon Chrome extension asks the server for work every few minutes and gets back the listings that are due, each with the Amazon domain it must be read from. It opens each product as a real page load in a tab of a dedicated background window, with images, fonts and media blocked so a reading costs a fraction of a normal visit, and closes the tab as soon as it has read it. One reading gives:
- Price and currency from the buy box, including the accordion buy box and Subscribe & Save.
- Stock: in stock, out of stock, temporarily unavailable, no featured offer, a purchase limit or a pre-order.
- Seller and fulfilment: who sells and ships it, and whether only a used offer is left.
- Delivery estimate in days, for the delivery guard.
- The ASIN the page actually served, because Amazon sometimes serves a sibling product instead.
The reader reference explains each of these in detail, including how a slow page is told apart from an empty buy box.
How often is each product checked?
Reading every product every hour would waste your connection and draw Amazon's attention for nothing. Instead, every listing gets a priority score from 1 to 10, built from recent eBay orders, the money at stake, views, conversion, how volatile the Amazon price and stock have been, and how long since the last reading. The score sets the time to the next check:
| Score | Level | Next check |
|---|---|---|
| 9.0 to 10 | Critical | 60 minutes |
| 7.5 to 8.9 | High | 3 hours |
| 5.5 to 7.4 | Medium | 12 hours |
| 3.5 to 5.4 | Low | 24 hours |
| under 3.5 | Dormant | 72 hours |
Some events jump the queue. An eBay order makes the listing critical and due at once, because you have just committed to buy at whatever Amazon charges now. A spike in views, rising conversion or an Amazon page that keeps going in and out of stock also promotes a listing. And a listing that is held or out of stock is read at least every 10 minutes whatever it scores, so it goes back on sale as soon as Amazon has it. The full rules are under which listing is checked, and when.
Is it also an eBay stock monitor?
Yes, and for a dropshipper the stock side matters as much as the price. When a reading shows Amazon cannot supply the item, the eBay quantity goes to 0 so you never sell what you cannot buy, and it comes back automatically when a later reading shows the item available:
| Amazon shows | eBay listing |
|---|---|
| Out of stock or temporarily unavailable | Quantity 0, restored on the next in-stock reading. |
| No featured offer (no buy box at all) | Quantity 0, restored when a featured offer returns. |
| Only a used offer | Held at quantity 0, released when a new offer is back. |
| Pre-order or a purchase limit | Quantity 0, recorded separately. |
| Page gone (Amazon's 404) | Recorded as product gone; you remap the listing or end it. |
Only a definite verdict can take a listing off sale. A timeout, a half-loaded page, a block page or a page that is not a product page at all is treated as inconclusive and read again later, never as "out of stock". When stock monitoring is on, quantity is a target rather than a floor: the listing is set to your default quantity, restoring one at 0 as readily as capping one that is too high.
Why read Amazon in your own browser?
Amazon shows different prices, currencies and stock to different locations and sessions. The only reading that matches what your buyer's order will cost you is one taken from a real browser at the right delivery location. A server in a data centre sees a different Amazon, and proxy pools get blocked. So Dropizon has no server-side scraper, no proxy pool and no third-party scraping service anywhere in the system.
Speed is set per computer. The tracker raises a PC's reading speed while Amazon stays quiet and lowers it at once on a robot check or pages that stop loading; you can set your own top speed instead. Each Chrome profile can serve a different eBay account, and separate computers never slow each other down. If Amazon pushes back, the extension changes the delivery postcode, pauses every reader for 15 minutes and resumes from the product it was refused on (see blocks).
Which guards check a reading before it is used?
- Page identity: a page that served a different ASIN from the one requested is refused, so a sibling's price never lands on your listing.
- Currency: a price in the wrong currency for the marketplace is rejected, because it means the delivery location is wrong.
- Error pages: a page that never loads is classified (Amazon's error page, a network failure, or a redirect loop caused by another extension rewriting Amazon links) and the log names the cause.
- Delivery location pin: a batch that cannot set its delivery postcode stops rather than read unpinned prices that would pass every other check and still be wrong.
Once a reading passes, the eBay repricer turns it into a price with your markup formula and its own set of price guards.
What if the Amazon product itself changes?
Sometimes the product behind an ASIN changes, not just its price: a different pack size, new contents, new photos. Selling the old description against the new product brings returns. When a reading confirms a material change, Dropizon takes the listing off sale, rebuilds its title, description, photos and item specifics from the new Amazon product, revises it on eBay and puts it back on sale. If eBay refuses the revision, the listing stays held with eBay's reason shown. A store can switch this off.
Where can I see the readings?
- The Price updates sheet in the extension: recent readings with the price read, the used price and the outcome (pushed, up to date, held, or not pushed and why), with filters and CSV export.
- Your own eBay item pages: a banner above the title shows whether the product is still sourceable, its priority level and a live countdown to the next check.
- Seller Hub's orders list: the same verdict as a chip under every item.
- The Processing page in the app: the latest result for every live listing, success or the reason it failed, with one click to retry the failures.
The tracker also feeds multi-variation listings, where every variation is read from its own ASIN, and the order flow, where a sale triggers an immediate reading. UK sellers should read the eBay UK page on delivery postcodes.
Questions about tracking Amazon prices and stock
Do I need proxies or a scraping API?
No. Every reading is taken in your own Chrome on your own connection, paced by a rate limiter that slows down at the first sign of pushback. There is nothing to rent and no IP pool to buy.
Does my computer need to stay on?
Yes, while you want readings. The server never fetches Amazon itself, so with the browser closed no new prices arrive, and Dropizon says so rather than guessing. A computer or a Chrome profile left open for the tracker is enough.
Can it track amazon.co.uk and amazon.com at the same time?
Yes. Each job the server hands out names the Amazon domain it must be read from, so a US listing is read from amazon.com and a UK listing from amazon.co.uk in the same batch.
How quickly does a stock-out reach eBay?
As soon as the reading is reported, every eBay listing of that ASIN is set to quantity 0 and the change is sent through eBay's APIs. Held and out of stock listings are then read again at least every 10 minutes, so they come back as soon as Amazon does.
Does it keep a price history?
Yes. Every reading is stored on the server with its price, currency, stock and time, and older readings are trimmed on a schedule. In the extension, the Price updates sheet shows recent readings with what happened to each one and exports them as CSV.
Will Amazon block my browser?
Amazon can show a robot check now and then. The extension detects it, changes the delivery postcode, pauses all reading for 15 minutes and resumes from the same product. If blocks keep coming, lower the top speed or the number of reading tabs.
Start tracking the Amazon products behind your eBay listings. Connect eBay, install the extension, set your marketplace and postcode, and the first readings arrive within minutes. Comparing tools? See Dropizon vs AutoDS.
Dropizon is an independent tool and is not affiliated with eBay or Amazon. Sellers are responsible for compliance with each marketplace's policies, including eBay's drop shipping policy.