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mwave offers the EZOPower 7,800mAh Rechargeable External Battery, model no. EZEBA13W, for $38.99 with free shipping. That's the lowest total price we could find by a buck. It features dual USB ports and is compatible with a range of cell phones and devices, including the iPad and iPhone, tablets, and more. A USB cable is required (not included).
Update: A reader notes that BlueMall via Amazon offers it for $34.99 with free shipping.