BrickMargin

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Your selling costs

These drive the buy-below figure on every set page. Defaults are typical for a US eBay seller without a store subscription — change them to yours and every number on the site recalculates.

eBay final value fee
0 if you never promote
What it costs you to send it
The profit you want on a flip

With these numbers

A set selling for $200 costs $43 to sell, leaving $158. To make 30% you'd need to buy it for $121 or less.