If I'm buying computers that are all going to be scrapped, first I don't count the steel in my figures. Then I assume the lowest value being a motherboard and no ram/finger cards/cpu/hard drive. For a small socket motherboard, I'd get maybe $1.50? Power supply and media drives are also not worth considering to me. I'd be comfortable topping out at 0.10/lb and try for less. If one were to look at the prices in my area that larger recyclers are offering for complete computers, that is totally fair.
Bookmarks