Dentists

Most dentist already recycle thru companies they purchase their stuff thru...kind of a buy back system.

Good idea. When I was a teenager I put in some hours with a family friend who made replacement teeth from platinum, gold, etc. Every few years he would rip up the carpet where he did his grinding and such to sweep up and cash in on the precious metals. So I would say most dentists know what their "scrap" is worth.