SNES Classic Mini Internal Bluetooth Modification : 6 Steps (with Pictures) - Instructables
SD Memory Flash Card Card Reader Converter Adapter For Nintendo Wii NGC Console|Replacement Parts & Accessories| - AliExpress
Rondo Products SNES-Con Kit – CastleMania Games
SNES PowerPak - retroUSB
By far the cheapest Micro SD method : r/miniSNESmods
Super Nintendo SNES Microsd Card Adapter for FX Pak PRO - Etsy
SD2SP2 Micro SD Card Adapter 1.2A SDLoader for Nintendo Gamecube Serial Port 2 - Stone Age Gamer
SD Memory Card Converter Adapter Suitable for Nintendo Gamecube/Wii Consoles NGC Port Video Game Console Card Reader Accessories|Memory Cards| - AliExpress
Brook Wingman SNES Brook Gaming - Official Brook Gaming Store
By far the cheapest Micro SD method : r/miniSNESmods