Star-Doo via eBay offers this 12,000mAh USB External Battery Pack in four colors, model no. PB-A408, for $15.98 with free shipping. (Select each item to see this price.) That's tied with our mention from four days ago, $27 under the lowest total price we could find for a comparable battery pack elsewhere, and the best price we've seen for any 12,000mAh portable battery charger. It comes with several adapters suitable for most types of charging ports, including iPhone, iPad, HTC, and other smartphones.