Um, I have one you can have (yes, have, lol, not buy.) The reason I have one I can let go is that I have two. When we added two 360's, we had to take one of the NES's out.
Regular loading NES systems have a "blinking" problem you may have heard of. You can get by it for a long time by simply cleaning your games and system. I'd have to check if our second system has it. One of them was doing it, and I installed the upgraded pin-set, on the one that was still set up, which was really simple and moderately cheap to do, btw. I just don't know if the other system was ever doing it. :?
I may have a game or two as well, which would require some time digging through the collection to see what I could give up,lol.
So let me know if you still need one! Email will get a faster response than a PM, if you don't mind...