By far the cheapest Micro SD method : r/miniSNESmods
Amazon.com: Super Nintendo SNES AC Adapter / AV Adapter / 2 controllers : Video Games
IC2005 Smart Shop :: Flash...
SNES Classic: *External* MicroSD, DC Input : r/miniSNESmods
For F-c Adapter For Snes Or Japanese 16bit Console, Play 60pins 8-bit Game Cartridge On 16-bit Console Whit 500 In 1 Game Cart - Accessories - AliExpress
Super Nintendo Original Console Bundle with SD2SNES - Stone Age Gamer
Amazon.com: SDHC + USB 2020 Adapter KIT with 4 GB Micro SD Will Work ON DS DSI 2DS 3DS : Video Games
1080P HDMI Adapter Converter & Cable For Nintendo 64/SNES/SFC Gamecube Console | eBay
The NES and SNES Classic systems support SD cards : r/miniSNESmods
Amazon.com: Brook Wingman SNES Converter - Retro Gaming Controllers Converter on NES, SNES, New FC, and SFC consoles. : Video Games
SDCard Cartridge is awesome! Worth of buying : r/snes
Amazon.com: SD Card Reader, uni USB 3.0 to SD/Micro SD Card Adapter, Aluminum High Speed USB to External Memory Card Readers for SD, SDXC, SDHC, MMC, RS-MMC, Micro SDXC, MicroSD, Micro SDHC,
Super Nintendo SNES Microsd Card Adapter for FX Pak PRO - Etsy
The NES and SNES Classic systems support SD cards : r/miniSNESmods
GUIDE / RELEASE] How to add a microSD card to the SNES internally and still use hakchi2 to sync games to it : r/miniSNESmods