The thing is, I got in a system recently, and the AC adapter is dead. I actually bought it as a non-working system, but in turn it's just the PS that's given up the ghost.
Let me know if it's the 9V or 5V version. The 9V version, just go get an old style Sega Genesis supply. If it's the 5V version, you can make one for around $25 or so.
C 10V 1000mA