Retro console replacement parts - controllers, cables, power adapters
Game cartridge cleaning kits - solutions, tools, brushes
Retro gaming display accessories - HDMI upscalers, CRT filters
Custom controller skins/shells - for GameBoy, SNES, etc.
Game storage solutions - cartridge cases, disc organizers
Retro console mod chips - region unlocking, enhancement chips
Reproduction game labels/boxes - for collectors restoring games
Console stands and display cases - acrylic displays, wall mounts
Retro gaming apparel - nostalgic graphic tees, hats
Handheld console accessories - screen protectors, carrying cases
RGB/SCART cables - high-quality video cables for old systems
Console dust covers - protective covers for displayed consoles
Retro arcade joysticks - USB versions of classic arcade sticks
Game Genie/cheat devices - enhancement tools for retro systems
Retro gaming magazines/books - strategy guides, collectibles
Custom LED mods - lighting kits for consoles
Memory card solutions - SD card adapters, backup devices
Controller extension cables - for classic systems
Retro gaming posters/artwork - pixel art, game covers
Portable battery packs - for Game Gear, Lynx, etc.

Pro tip: Focus on accessories rather than consoles themselves - they have better margins, fewer authentication issues, and consistent demand from collectors and enthusiasts!