This DIY kit lets you use an old Nintendo 64 controller wirelessly with the Switch - The Verge
Amazon.com: PowerA Nano Enhanced Wireless Controller for Nintendo Switch - Grey-Neon, Works with Nintendo Switch Lite, Bluetooth Controller, Gamepad, Compact, Smaller, Rechargeable, Portable - Nintendo Switch : Everything Else
8BitDo SN30 Pro Bluetooth Gamepad Gray 80DM - Best Buy
PowerA Nano Enhanced Wireless Controller for Nintendo Switch | Nintendo Wireless controllers for Switch & Switch Lite | PowerA
Pro Controller for Switch - Hardware - Nintendo - Nintendo Official Site
Dropshipping 2.4GHz Wireless Gamepad Controller for Super Nintendo NES & SNES Classic Mini Wireless Console Controller Joystick - AliExpress