eCase via Amazon offers the Kmashi 15,000mAh MP836 Dual-USB External Battery Pack
in Black/Red for $17.99. Coupon code "D2UZZHUS" drops it to $14.99
. Plus, Prime members bag free shipping
. (Non-members can spend $35 or more to qualify for free shipping; otherwise, shipping costs $6.93.) That's $12 under the lowest total price we could find for any
15,000mAh dual-USB battery pack and the best deal we've ever seen for such a battery pack. It features 1- and 2-amp USB ports and four status LEDs.