I got it for $10 a few months ago. Works great, but the cable they include with it sucks ass. I had to fiddle with it to get it to charge my phone each time, but when I use a better cable it works perfectly.
My brother actually recieved one of these this weekend when I was visiting. It's decent, but it is midling quality. The buttons' fit is not super straight, and the plastic is not the highest quality. +1 re the crappy cable.
But it's been this price since december according to the camelizer.
I bought the Aibocn® Power Bank 10000mAh unit for $12.99 only because they deliver Prime on Saturday - the other one I'd have to wait until Monday. If it sucks, I'll 2-day FedEx it to Kyle maybe he can put a .22 rimfire through it (less expensive that the .50s)