raphnet. - Dreamcast controller to USB adapter (v2)
Amazon.com: Retro-Bit Official Sega Saturn USB Controller Pad (Model 1) (Old Version) for Sega Genesis Mini, PC, Mac, Steam, RetroPie, Raspberry Pi - USB Port - (Slate Grey) : Video Games
raphnet. - Dreamcast controller to USB adapter (v2)
Sega DreamCast Controller – Many Cool Things
Amazon.com: Sega Dreamcast Controller (Original Gray) : Unknown: Video Games
Sega Dreamcast Original Controller - White (Average Condition) - Stone Age Gamer
Amazon.com: Sega Dreamcast Console : Sega Dreamcast: Video Games