How to Use a Gamecube Controller on a Wii: 5 Steps (with Pictures)
Amazon.com: SogYupk 2 Pack Controller Replacement for Gamecube Controller,Wired Controllers Classic Gamepad compatible with Nintendo and Wii Console Game Remote(Black 2 pcs) : Video Games
Wii U's GameCube controller will support more than just Smash Bros. [updated] | VentureBeat
Nintendo Support: How to Use Nintendo GameCube Controllers
Amazon.com: Old Skool Controller Compatible with Gamecube/Wii - Orange (Spice) : Video Games