LumsingDirect via Amazon offers Prime members the Lumsing 10,000mAh 3 USB Port Power Bank in Black or White for $19.99. Coupon code "LUMGLORY" cuts it to $9.99. With free shipping, that's $5 under our October mention, $30 off list, and the lowest total price we could find. (Non-members can spend $49 or more to qualify for free shipping; otherwise, shipping costs $6.21.) It's compatible with iOS or Android devices, features three USB ports, and comes with a USB cable. Deal ends January 15.