I destroy hard drives for a fee and then recycle the rest of it. The magnets get around $0.80 each sold in lots on ebay. The top is stainless, the case is aluminum. The read/write head/arm is aluminum with some copper and steel bearings. Motors go in the motor bucket, logic boards get sold for $10-$14 per lb to gold recyclers. The platters are cut into 4 with a metal sheer and then recycled as aluminum. Each drive takes me about 5 minutes to fully process.