ATC via Amazon offers the Lumsing 12000mAh Portable Battery Pack in Silver, Gold, or Pink for $25.99. Coupon code "67CDRZOC" cuts it to $19.99. Plus, Prime members grab free shipping. (Non-members can spend $49 or more to qualify for free shipping; otherwise, shipping costs $5.99.) That's $17 off list and the lowest total price we could find. It features two USB ports and a Lightning input. Deal ends September 18.