Located in the sidebar under Find Build Shop, there are two new links:

DealExtreme: Parts, controllers, games, weird USB toys, PS2, PS3, Xbox360, Wii, Fake iPhones that really work, knock-offs, etc, etc. Cheap stuff from China.

RetroZone (RetroUsb.com): POI posted this link in a comment and I was so taken with it I had to make it a perma-link. They sell new parts for NES and SNES carts and controllers. For instance, they have an adapter that will allow you to use a Standard NES or SNES controller on the Wii (or GameCube!). They have replacement casings for NES carts, they have EPROMS, clock chips, Clear Cart cases and more at fairly reasonable prices.