Gooloo via Amazon offers the Gooloo 12,000mAh Portable Battery Pack and Car Jump Starter, model no. GP11, for $49.99. Coupon code "RRXSJV6V" cuts it to $39. With free shipping, that's $101 off list and the lowest total price we could find. It features dual USB ports and includes a jump starter, jumper cables, 12-volt wall charger, and 12-volt car charger.