Ryobi BD4600 belt/disc sander I picked up on Kijiji for $10 CAD (including a brand new $7 sanding belt). Cogged drive belt was stripped, didn’t come with a mitre table or a work stop, and the belt bed was twisted from the sander being dropped on the concrete, or something concrete-like dropped on it.

Spent $5 to replace the belt (pain in the ass to find locally when you have no idea where to shop for belts). Untwisted the bed by clamping it to my workbench and torquing on it with a 1" combination wrench. Made a work stop out of 1/8" steel plate. Made an adjustable mitre table out of aluminum.

A fun project, and now I have a fully-functional belt/disc sander for a grand total of $15.25 after tax and a few hours’ work.