I use to visit our local electrical scrap heap. I find all kinds of hardware.
Lately i found a k6-2 450 with mobo, a pIII 1GHz with mobo and leaking caps, an athlon 1400 thunderbird with mobo and bad caps, duron 1300, some amount of celerons, some newer broken mobos.
I used the caps from the broken mobos and fixed the PIII and the Athlon.
Works perfectly.
The only thing people seem to remove before garbaging computers is memory =(. But that is availible at equiv 20$ / 256mb or less..
Once i bought a 128mb module for 12$ from a guy. Only it showed to be a 256mb hehe. Some mashines could only see 128 of it and so did his =)