http://www.amazon.com/dp/B074FWK46G is where you can get one!
I look forward to slapping this on a board and putting it through its paces in the future. I'm currently waiting on a new board to arrive, but wanted to show this supply all on its own before the 'board build' demo.
From their site: Use this Boxking Rechargeable Pedal Power without plugging into the wall. (pure batteries power noise free very quiet)
And it can also use with plugging into the wall if forgot to charge.(but it maybe not as quiet as that without plug into wall.)
Features
1) Most powerful ever pedal power 12800mAh( eg. can power5pedals 10-16hours, can power10pedals 5-8hours)
2) Very convenient .you can play the show without the power supply/pedalboard plugging into the wall.
3) Enjoy sound of quiet, pure batteries power.
4) World Top Brand Panasonic / LG Li-ion Batteries lifetime is very long can be recharged tons of times.