Vantrue via Amazon offers the Solove Titan Ultra Slim 20,000mAh Dual USB Portable Charger / Power Bank in Silver (pictured) or Gray, model no. A8, for $44.99. Coupon code "5LXBDTYR" cuts it to $34.99. With free shipping, that's $95 off list, tied with our June mention, and the lowest price we could find. It features over-current and over-heating protection, can charge two 5-volt devices simultaneously, and includes a digital LCD indicator.

Vantrue also offers a Solove Roco Ultra Slim 10,000mAh Dual USB Portable External Battery Charger / Power Bank in Silver for the same price with no coupon.