My best find was like 20+ years ago. A woman was setting an old Commodore monitor out to the curb so my mom stopped her and asked if we could take it. She said it didn't work but we could have it.
This monitor was for the C-64/C-128, and had a 40 column mode and a monochrome 80 column mode, each of which had separate hookups, and there was a switch on the front to flip between the two. It was set to 80 column mode and the woman had a 40 column hookup. All we had to do was flip the switch and it worked. Still works now I believe.
