6 speed rear derailleur and front triple derailleur - $

I picked up a project bike (18 spd mt bike) over the weekend and it needs new derailleurs and a chain. It's not worth putting much money into because it would cost less to replace it, but I don't want to just throw it away. If anyone has a set of derailleurs that they are getting rid of, I'd be glad to "dispose" of them for you!Thanks in advance,Rachel