What kind of parts? And which games?
If you mean joysticks and buttons, you could probably get a few bucks for them on eBay (or the Buy/Sell/Trade forum). If you're talking about special controllers, like trackballs, spinners, or flight sticks, you could probably get more than a few bucks for them.
If you can post a fairly detailed list of what you've got, preferably (but not necessarily) with pictures, it would help.
Good luck!