I would hack them, and sell them here. BUT, Ive never hacked a dreamcast control before, so mine will be my first attempt. Also, 3 of the 4 are a weird kind of madcatz PCB. They still have the holes, but they are on a smaller pcb on the main pcb. Just thought I would let you know.
I bought them for $9.99 each at Hollywood's Game store. So I would sell them for that plus shipping, however much that would be??? Just let me know guys, if not, I guess Im S.O.L.