$10 price drop. Amazon with AnkerDirect has the Anker Astro3 Dual USB Output 10000mAh External Battery Pack for
$40 with free shipping. Features 5V/2A output for tablets and 5V/1A output for phones, two USB ports and has enough power to recharge most smart phones over 6 times.
EZOPower 5000mAh Dual USB External Battery Pack for $25 shipped