Gooloo via Amazon offers its Gooloo Quank2 8,000mAh Portable Battery Pack, model no. F004, for $29.99. Coupon code "M4MAOW5M" cuts that to $15.89. Plus, Prime members bag free shipping. (Non-members can spend $49 or more to qualify for free shipping; otherwise, shipping costs $6.82.) That's $64 off list and the lowest total price we could find. It features an LED flashlight.