Same kind of question as the OP, but... I'm really looking for a one time use kind of setup, i have a li-ion battery and some cables and such coming from ToddR, but it won't make it in time for Derek Trucks Sunday..
BAsically i can use all that ratshack stuff, are there cheaper battery options?
*update*
Put together a pretty cheap set up, we'll see how it works. Just a 1600 mAh 9.6V RC battery, a couple adapters and the adaptaplug. All told, it was ~30-40$ and the battery is rechargable so it can serve as a back up in the future when better power options run out.