The Commodore 64 GS, also known as the Commodore 64 Game System, was released in Europe back in 1990 and was Commodore's attempt at entering the still lucrative 8-bit console market. It was essentially a consolized Commodore 64 computer in a new ugly box that lacked a keyboard and could only play cartridge games. Obviously it flopped and is now considered quite a collectible.
You can bid on a fully working C64GS via this Commodore 64 GS eBay auction. It comes complete with three joysticks, the pack-in cartridge sporting four games (Fiendish Freddy's Big Top O'Fun, International Soccer, Flimbo's Quest and Klax) and a boxed copy of Jupiter Lander. Seller ships worldwide.