Omaker Official via Amazon offers the Omaker 15,600mAh Charger
in Orange/Grey or Blue/Grey, model no. S-X6OR, for $29.99. Coupon code "22NUA55F" cuts it to $24.99
. Plus, Prime members bag free shipping
. (Non-members can spend $35 or more to qualify for free shipping; otherwise, shipping costs $6.76.) That's $45 off list and among the best prices we've seen for a charger of this capacity or larger. It features a microUSB cable, two 2.1A USB outputs, and 15,600mAh charging capacity.