GameCube controller support comes to Nintendo Switch - Polygon
GameCube Controller Adapter for Wii U, Nintendo Switch and PC USB by L
Amazon.com: Nyko Retro Controller Hub - 4 Port GameCube Controller Adapter for Nintendo Switch : Everything Else
Amazon.com: Y Team Controller Adapter for Gamecube, Compatible with Nintendo Switch, Super Smash Bros Switch Gamecube Adapter for WII U/PC with 4 Port : Video Games
SOSav - GameCube Controller Adapter compatible Nintendo Switch / PC
This Portable GameCube Controller Switch Adapter Hits Kickstarter Next Month | Nintendo Life
Ultimate GameCube Adapter by Panda Hardware — Kickstarter
Nintendo Switch GameCube Controller Adapter - (NSW) Nintendo Switch – J&L Video Games New York City
Nintendo GameCube Controller Adapter - Imported from Japan (Nintendo Switch) - Walmart.com