One of Anker's newest battery packs is currently on sale. This is their PowerCore 15600, which is a 15,600mAh battery pack with two USB ports. Both ports use Power IQ Technology, which isn't quite Quick Charge, but it reads your device to see how much power it can take and pushes as much as it can handle, to the device. Right now the PowerCore 15600 is going for $33, but with the promo code you can grab it for $24.99. You can grab it from the link below.
Anker PowerCore 15600 - Most Powerful Power Bank - $24.99 w/ code RGNUEBLC