Unsoldering resistors, capacitors, etc from old VCR mainboards. 1 cent per part; 1.5 cents if I sorted them by spec. My family had an electronics repair shop. I think I was eight or nine. (Back then components were about the size of a large ant, not stuffed in by the billion)

I've been thinking about this lately -- giving kids work gives them skills and I think people would be surprised what they can handle.