Anker Direct via Amazon offers the Anker PowerCore 10,400mAh Portable USB Charger, model no. AK-A1214011, for $19.99. Coupon code "B32MMKCP" cuts it to $15.99. Plus, Prime members bag free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise, shipping adds $5.99.) That's tied with our mention from two weeks ago at $26 off list and the lowest total price we could find. It features PowerIQ technology.

Orders placed by December 22 are guaranteed to arrive in time for Christmas via Prime shipping; otherwise, upgrade to 2-day shipping by December 22 for $10.99 for guaranteed delivery.