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← ylishi.toolsKey fact: A follow-sell attack rarely destroys profit through the unit price alone. It destroys it through Buy Box share, because storage fees and advertising keep running on inventory that has stopped selling. The free Follow-Sell Monitor tracks competitor pricing against your own floor, so the squeeze shows up while there is still margin left to defend.
| Product | Your Price | Competitor Price | Lowest | Price Gap | Your Margin | Alert | Last Checked | Actions |
|---|---|---|---|---|---|---|---|---|
No products tracked. Add your first product to monitor follow-sell activity. | ||||||||
Follow-sell happens when another seller lists the same ASIN and takes a share of the Buy Box. Amazon splits the sale between the competing offers, so your units sold drop even though your price has not changed. Left unwatched, a follow-sell attack can cut your Buy Box share from over 90% to under 40% within days.
You add an ASIN and the tracker records the competing offers and the current Buy Box holder on each check. A price change on a competing offer is flagged, so you see a price war while it is still one seller rather than ten, and you can react before the Buy Box is lost.
A follow-sell attack rarely destroys profit through the unit price alone. It destroys it through Buy Box share, because storage fees and advertising keep running on inventory that no longer sells at the rate you planned for. Monitor share, not just the price on the listing.
Yes. The follow-sell monitor is free, needs no sign-up, and the products you add stay in your own browser rather than on our servers.
❓ Amazon Buy Box Tracker — Frequently Asked Questions → fees, limits, and worked examples
Every rate card behind this tool comes from our open dataset — 2026 Amazon FBA fee snapshots (CC BY 4.0). What changed between monthly snapshots is dated in the Amazon FBA fee change log. Machine-readable JSON, free to cite.