Need help finding a PSU for an XRGB2

Ok,

So I just bought this xrgb2 without a power supply, and figured it would be an easy item to track down. I took it to Radio Shack and asked if they had a Universal PSU that would fit the thing, and the guy basically laughed me out of the store saying that they dont carry DC wall plugs. Anyone who has one of these that could help shed a little light on this?

Thanks

-DZ

What's the rating and polarity? Should be on the XRGB near the socket.

Looks like it's a 12v with positive tip polarity.

13.8v dc

Tip positive for the polarity.

So are there any places you could recommend I attempt to find one of these plugs James?