I have a flash 2 advance ultra 128MB, with the cable, all in good condition (including battery). I'm thinking of selling it. How much is it worth? How much would you pay for a Game Boy bridge (USD)? Never used, in box. Used only a couple of times. Still in box. This device lets you backup and restore save files from Game Boy Advance games (can be used with a flash cart to transfer saves from your retail carts).