If it is USB then you could most likely buy an adapter online to plug it into the wall outlet with. Just thought I'd let you know :). If you happen to have one for your cell phone or other small device already, you could even try that. Ipod works too (their wall adapter plug).
There are many times I simply just switch back and forth between devices and wall adapters. The connection is the same, anyhow. The only thing you might want to check (I have to admit I'm too lazy to most of the time myself) is what the voltage is. But like I said, if you take one from a small device there is no reason they should use similar voltage, and of course a USB connection is a USB connection.
Oh, and if you have to buy one because you don't have adapter? I'd suggest ebay. Anything from China. They make the cheapest. You could get one for 99 cents including shipping; of course, it's -made- cheap as well but I've never had problems so far. They also take like a month to get to you cause they're from China. Still worth it though!