Amazon.com: Retro-Bit Tribute 64 2.4 GHz Wireless Controller V2 for Nintendo 64 (N64), Switch Online, PC, MacOS, RetroPie, Raspberry Pi and Other USB Devices (Classic Gray) : Video Games
Nintendo Switch online VS original N64 controller : r/n64
Nintendo 64 Games Reportedly Coming to Nintendo Switch Online
You can now buy the Nintendo 64 and Sega Genesis controllers for Switch - The Verge