Landlords have to get rid of old washers and dryers every time they renovate a unit, and most of those machines still run. Offer to haul them away free, test them, and resell the good ones for $300 to $500 a set. One small Kansas shop sold 40 appliances in its first months doing exactly this.

Goodwill sells unsorted clothes by the pound at its outlet stores, and resellers photograph the good pieces on a folding table and list them on Depop. One San Francisco seller turned $50 of vintage boots into $1,000. The rest goes out in bulk on live auctions.

California makes almost every big diesel truck pass an emissions test twice a year, and soon four times. Fleets hate losing a truck for a morning, so a tester with a small reader and a laptop drives to the yard instead. The kit costs about $1,429 and each test pays $75 or more.