I have, I got a
RF P1200.2 for ~$150 shipped
RF P200.2 ~$60
Alpine CDA-9815 (came in a 4 piece deal thing with 3 other stereos total was $80)
Pioneer Avic D3 ~150 (speaker outputs were blown, scratch on the front, and no harness; RCA's still worked)
My dad has also gotten some stuff from there, and since hes an electrical engineer, we buy stuff even if it says Untested or something so we can fix it.