Pisen Electronics via Amazon offers its Pisen 2-in-1 Portable Charger and 5,000mAh Travel Battery Pack in several colors (Gold pictured) for $18.99. Coupon code "PISENTEC" drops it to $12.91. Plus, Prime members bag free shipping. That's $6 off list and the lowest price we could find. It features a folding AC plug. Deal ends December 31.