GitHub - drhelius/arduinogameboy: Arduino based Game Boy cartridge reader and writer. It can dump ROM and RAM to SD card.
Amazon.com: EZ Flash Junior MicroSD Adapter for Classic Gaming on GB/GBC/GBA (EZFlash Jr.) EZ-FlashJr. is The Best Flash Memory Card for Gameboy Color & Gameboy Original (Similar to Everdrive) : Video Games
Open Source Cartridge Reader V3-ALTER Build service [Group E]
Amazon.com: Nintendo e-Reader - Card Reader for Game Boy Advance : Video Games
Cart Flasher for GameBoy from J.Rodrigo on Tindie
Gameboy Game Card Reader Cartridge | Gameboy Advance Games Cartridge - Card - Aliexpress
Gameboy Advance CARD e READER PLUS AGB-014 Cartridge only Nintendo C gba 4902370506570 | eBay
Game Boy Game Cartridge Slot | Hand-Held Legend
Glacier Game Boy Advance with e-Reader Bundle : Video Games - Amazon.com