eBay stock and price sync: stop selling what you cannot get

Why listings drift from your supplier

The moment you list a product, two things start moving without you. Your supplier’s stock goes up and down as they sell to others, and their price changes with their own costs and promotions. Your eBay listing does not move at all. The longer you leave it, the wider the gap.

What a stale listing costs you

• A sell-out you did not notice. A buyer pays for something you cannot get. You cancel and refund, and eBay counts a cancellation for an out-of-stock item as a defect against your seller standards. Too many can restrict your selling.
• A price rise you did not notice. Every sale until you spot it earns less than you planned, or loses money.
• A price fall you did not pass on. You sell fewer than you would at the price your costs allow.
• Time. Checking a shop’s pages by hand is the kind of job that gets skipped on the day it matters.

How to keep listings in step

1. Decide how often to check. Fast-moving suppliers need frequent checks; steady ones do not. A few hours is a sensible starting point, because most stock and price changes are not minute-by-minute.
2. Read the supplier’s price and stock reliably. From a product page, a feed, a spreadsheet or an integration. Whatever the source, be able to tell “out of stock” from “I could not read this page”.
3. Act on the difference. Update the eBay quantity and price, keeping your return on what you spend.
4. Keep a record. If a listing changed, you should be able to see when, and from what to what.

Guard rails that matter

Automatic changes are only as safe as their limits. A page that changes its layout can look like “price £0.99” or “in stock” when it is neither. Useful protections:

• Hold big jumps. If a price moves more than a set percentage, wait for a person to approve it. A misread £1.99 must not reprice a live listing.
• Never treat “unknown” as “in stock”. A page that cannot be read should leave the listing alone, not guess.
• Let sell-outs through. Even while a price waits for approval, a genuine sell-out should still be sent so nobody buys what you cannot get.
• Stop if too many pages fail. If most of a run cannot be read, the supplier has probably changed its site. Send nothing and tell the seller.
• Cap the number of changes in a single run, so a fault cannot rewrite your whole shop at once.
• Quiet hours. Do not let changes go out when you would rather they did not.

Out of stock: set the quantity to zero, or end the listing?

Setting the quantity to zero keeps the listing’s history and lets it come back when the item does, but it only works cleanly if your eBay account is set to keep out-of-stock listings live. Ending the listing removes it, and relisting later costs you the history. Whichever you choose, check how eBay treats a zero quantity on your account before you automate it, because if it is not set up properly, a “sell-out” update can fail to take effect.

What to look for in a tool

• It tells you when it could not read something and does nothing rather than guessing.
• You choose the limits: the jump size, how often, how many changes.
• You can see every decision it made, with old and new values.
• Your supplier’s name never reaches the listing.
• It works from your own account and computer, so you are not handing your eBay login to a third party.

Sellhelm’s supplier watching does this for 32 built-in shops and any other shop you paste a link from. You choose how often it checks (from every 30 minutes to every 24 hours, default 4), it holds any change over your limit (default 25%), and it sends nothing at all if fewer than 80% of the pages it could reach were readable. See what to look for in eBay dropshipping software to compare it with any other approach.

Questions people ask