mwave offers the EZOPower 2-Port External 7800mAh Backup Battery, model no. EZEBA13B, for $28.99 with free shipping. That's tied with our September mention and the lowest total price we could find by $7. It can be recharged by USB and can charge up to two devices — such as an iPhone, iPod, Nintendo DS, or Kindle — at once.
Posted October 2, 2012