They make adapters that will allow you to plug any USB powered device into a regular wall outlet. They sell them at most electronics stores. Here is one: http://www.bestbuy.com/site/olspage.jsp?...
They make cheaper ones that are not Apple products, but as long as you can plug your USB cable into the adapter and connect the adapter to a wall outlet, any similar product should work. They are called USB at AC adapters or something similar to that.