How much does it cost?
It should come with a USB cable, to charge it from your computer. If you have a power adapter converter for any other USB device (an iPod for instance), that should work for the Kindle as well.
We bought a Duracell USB power adapter last year for DD when she want away for the summer, and wouldn't have a computer to charge her iPod. We now use it for other DD's Kobo reader as well, and it works with my Galaxy Tab, though that came with its own adapter.