Disperse Dev via Amazon offers the Zoom Power Bank TRUE 6,000mAh Dual-USB Portable Battery Charger in Blue, model no. Z-6000, for $44.97. Coupon code "ZOOM4TEN" drops it to $10. With free shipping, that's $80 under list price, the lowest total price we could find, and a very low price for a 6,000mAh portable charger. It features an aircraft-grade aluminum case, LED lights displaying the remaining charge, three-in-one charging cable (Lightning, mini-USB, and 30-pin connector), and purports to charge most smartphones four times on a single charge.