learning the ropes: good sources of scrap?

I find computers worthwhile. Lots of cords containing #2 copper. Then you can break down the rest of the casing and it doesn't take alot of room if you wanted to hold them until you had 100 pounds of it. Be able to stick that in a wagon fairly easy. If you wanted to get the next step, you have some brass connectors as well.. would take a while to build up weight, but store them in a coffee can until it is full. Check ebay for the circuit boards, there are people that are willing to buy them, if the price is right. I have a stack I am gonna post this week and see what happens.