This
http://www.amazon.com/SNES-RetroPort...0223796&sr=8-1
or this
Amazon.com: Retrolink USB Super Nintendo SNES Classic Controller: Software@@AMEPARAM@@http://ecx.images-amazon.com/images/I/41B3NbNSO3L.@@AMEPARAM@@41B3NbNSO3L
Looks like it is out of stock right now. I bought an NES one of the USB adapter, works great.
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