I've been to three different yards locally, and they all do the same thing. When I give them a copper and aluminum heat sink, they pay me a dirty aluminum price. It's usually like $0.18-$0.25 or something horrific like that. So, now I just keep one in my truck, and anytime I go to a different yard, I ask what they will pay for it. Hopefully I find one soon that will give me a fair price. For now, I am just stockpiling them.