There also are a lot of 1970s cameras made by Vivitar, Chinon, Petri and others available for $20 or less.

The Vivitar XC-3 is a very nice camera and usually needs only to have its seals replaced. There also is a module that slides into the hot shoe and plugs into a port near the lens mount that gives it autoexposure.

I've bought several and never paid more than $12, and that includes the standard lens.