Amazon.com: HORI Battle Pad for Wii U (Mario Version) with Turbo - Nintendo Wii U : Video Games
Amazon.com: Official Nintendo White Classic Gamecube Controller : Video Games
How to Connect a GameCube Controller to the Wii - Howchoo
Nintendo Gamecube Controller Pad for Wii U Super Smash Bros. White from Japan 4902370522846 | eBay
Just Got One of Those Gamecube Controllers That Plug Into the Wii Remote. What's the Difference Between These and the Actual Gamecube Controllers? : r/smashbros
nintendo wii - Using GameCube discs on wii (controller) - Arqade