I once found 2 A500's next to a skip. 1 of them was broken including the case but had a good floppy drive and the other worked perfectly after a good cleaning. Even the 512Mb expansions in both of them still worked

I also found a 486DX40 last week. The battery leaked and so the keyboard port no longer worked, but it had a good floppy drive and a quantum bigfoot 1gb hd and a 200 watt AT psu (perfect for my a4000T)