Brova Power via Amazon offers the DBPower 26,400mAh Laptop Portable Battery Pack for $89.99. Coupon code "KVL3NH5Y" drops the price to $59.99. With free shipping, that's $9 under last month's mention, $30 off, and the lowest price we've seen. It features a 2-prong AC outlet and two USB charging ports. Deal ends December 16.