Like going to a junk yard...
Recycling centers. You may need to hunt around a bit. Some only take cans and bottles. Not the place to go. Look for some place that takes anything.<br />
I used buy hurricane grade aluminum for a dollar a pound, for body panels and other toys and projects.
California is pretty far. Do a local search for recyclers that take scrap metals. You won't be able to do this over the phone. You have to ask the guy in charge if he will sell to you and you will not get him on the phone. Walk in, ask whoever looks like they are in charge if you can buy scrap. If so, most will let you walk around and pick what you want. Don't ask for a receipt.
Junkyards are your best bet.
yeah all over the place