I bought an air-cooled 5hp Sears outboard at a garage sale for $20. It ran, but needed a little carb work.

A guy I knew wanted it, and traded me EVEN UP a left-handed (which I am) Rem 760 Gamemaster in .270 with a Unertl scope on it. The scope is worth about $250 and the gun a little more.

We were both happy. He had never shot the gun, and I had never run the motor. They were both used after the trade.