The RetroN 3 gaming system is compatible with NES, SNES and Sega Genesis cartridges. It comes with six controller ports - 2 for each of the previously mentioned consoles, so you can use your original controllers from your chosen system. Or if you like, it also comes packed in with two wireless controllers of its own. It's available now for $69.99 USD in either red or black (which actually looks more grey than black...).
Ordering information can be found here.