When I moved I had a few hundred pounds of older PC parts and even a few complete desktops which I moved out on Freecycle.com. You can also check out the free area of craipslist.

It was all free on freecycle yet what was amazing were folk that wanted me to deliver, setup, show how to run a PC then give them long term support. They didn't get the free stuff. Amazing.

Eventually a good soul came along that understood the game and they hit the jackpot of sorts.