Ah, yes...I still have a working NES, the oldest nintendo system I believe...I also have 2 controllers, and a gun for the game Duck Hunt, which I also have...Now, I'm guessing these things would be worth something since they're super old?
Some of the game nerds out there would probably love to have a NES. If you had more games I'm sure you could get 70-80 bucks for it.
Go check what they're going for on eBay, that's usually a pretty accurate indication of what you can get for it.