raphnet. - Classic controller to Gamecube/Wii adapter
Wii Classic Pro Controller for Wii and WiiU - White - Walmart.com
2-pack Classic Controller Pro for Nintendo Wii - Black - Walmart.com
LUXMO 3 in 1 Classic Controller for Nintendo Wii/Wii U/NES Classic Edition (NES Mini), Classic Console Gamepad Gaming Pad Joypad for Nintendo Wii Wii U (Black) - Walmart.com
The mini NES Classic controller works with your Wii U Virtual Console games - Polygon
Old Skool Classic controller for Wii and WiiU - White - Walmart.com