These are game cases specifically designed for classic Sega system cartridges of the Genesis / Mega-drive, Master System and 32X. If quality matters
SEGA Game Gear Game Cartridge Cases
8-Bit Box: Pixoid – Board Game Review – MLGG: Pop Culture News
Sega - 32X - Accessories - Storage / Protection - Stone Age Gamer
Duck Tales with Bitbox Case - NES
Adventures in Video Games: CustomGameCases.com - A Review
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Game Boy: The Box Art Collection, 54% OFF
Stone Age Gamer BitBoxes Vol. 2
BitBox Sega Game Case - Stone Age Gamer
FANTASY ZONE - In Custom BitBox Display Box! (NES Nintendo
BitBox Game Case Overview
BitBox Sega Game Case
BitBox Deluxe Case for Flashcarts - Stone Age Gamer
BitBox Game Gear / TurboGrafx-16 Game Case - Stone Age Gamer
Stone Age Gamer - Sega Master System