I’m always fascinated by people who go to eBay to look for prices (e.g. to sell stuff at flea markets).
eBay prices for currently listed “buy now” stuff are the prices _the stuff doesn’t sell at_, otherwise it would have sold already.
You need to look at actually sold listings; and adapt for the audience (flea market = not as many people as all of eBay and no returns etc, so you need to be lower).
This isn’t rocket surgery.