I nabbed a filthy Commodore 64 and Apple IIC for $40 at the Vintage Computer Federation swap meet. Here are some pictures of the meet:
Prices were pretty good, I witnessed a boxed Amiga 1000 with keyboard, mouse, original disks/manuals, and a 1080 monitor sell for $250!
Here are some before/after shots of my pick ups. I swear sometimes it looks like these people bury their computers in the ground! Still have to disassemble and clean the insides and then finally test for functionality.