There’s a good chance that the $100 printer, the $300 wide-screen monitor, or the $170 router you recently bought from Amazon weren’t supplied to the e-commerce giant by their original manufacturers. In fact, the order may have been fulfilled by someone like Casey Parris, who resells items that customers previously returned to retailers.

Based in Florida, Parris spends about five hours each day visiting thrift stores and scanning auction and liquidation websites for interesting items, he told CNBC. Sometimes he finds auto parts, other times it’s a pair of sneakers, and occasionally he purchases printer cartridges — all with the goal of reselling them.

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