Batteries

Now I know what the screen will be, now I have to get the Power, power, (power). I could get a USB battery pack that should be able to do it, from Adafruit, but then I’m looking at hack cords and shit. This isn’t a game killer, but it’s definitely not ideal. Option two would be heading a battery off of Sparkfun, which I might do, but I need to do the math on that. Last, and maybe the easy I’ll go, is buy one off of (the one place, mentioned by Afrotechmod), but dear Lord of Infernal Resistance, I hate searching that website.
More research is necessary.
I also should really get this going so I have some sense of accomplishment.