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How to find things to sell at a swap meet
Scout the swap meet.
Before deciding if you want to become a seller and what you want to sell, take a few laps around the swap meet on different days. Find out what seems to sell well and what does not.
A common target profit margin for small items at swap meets is 30-35% (if you are buying things to sell). So if you are looking to make real money and not just have some fun and/or clear out your attic, you need to put some thought into what you want to focus on selling.