4 in 1, SAFFUN Classic Controller Compatible for Nintendo Wii/Wii U/NES Classic Edition (NES Mini) / SNES Mini, Classic Console Gamepad Gaming Pad Joypad for Nintendo Wii Wii U (White) - Newegg.com
SNES Classic Mini Controller - Walmart.com
Modifying the Linux kernel to enable SNES Classic Controllers
Adventures in Controller Swapping - Old School Gamer Magazine
Wii - Original Controller / Pad #SNES Classic Gamepad (NEU & OVP) | Konsolenkost
raphnet. - Classic controller to SNES adapter
The mini NES Classic controller works with your Wii U Virtual Console games - Polygon