Thier price list for aluminum transformers does say same as tin. For motors, they must be copper wound and they have 2 prices, over and under 75 pounds (each motor). I've never tried computer fans or copper aluminum heat sinks there. I do those at a different yard. Fans go as copper bearing at 4 cents. Copper aluminum heat sinks same as copper aluminum radiators. I did get screwed (at a yard in mass) on dirty copper aluminum heat sinks. They paid dirty aluminum, said there wasn't enough copper in them. Next time, I'm cutting the magnetic screws off.