mwave offers the EZOPower 7,800mAh Rechargeable External Battery, model no. EZEBA13W, for $24.99 with free shipping. That's $4 under our October mention and the best price we've seen for this model. (It's also a current price low by $8.) It features dual USB ports and is compatible with a range of cell phones and devices, including the iPad and iPhone, tablets, and more.