They're not too horribly priced at radio shack. Can't remember the exact tip, but if you take in the unit most shacks have the test plugs where you can figure it out. Once you have the plug figured out you just have to figure out the polarity (should be right on the unit) and the voltage/amperage. I believe you're looking for a 12v, 1.5a adapter. (someone please correct me if I'm wrong)If you're not comfortable with going the radio shack route, I can probably custom make you an adapter that would work. I'd just have to pull my TG-CD unit out of the attic to test it on. Been a while since I played on it, the duo-r is a lot more convenient.