Pisen Direct via Amazon offers the Pisen 10,000mAh Portable Power Bank in Red or Gold for $23.99. Coupon code "PISENPRO" cuts the price to $15.83. With free shipping for Prime members, that's $8 off list and the lowest price we could find. It features an LED digital display, one micro USB charging cable, and dual 2.4-amp USB charging ports. Deal ends December 31.