FreedomPop via eBay offers its FreedomPop 2,200mAh Portable USB Power Bank, model no. AFT-PWB-01-2200, for $3.99 with free shipping. Plus, bag 500MB of data on an existing FreedomPop account for free via this mail-in form. That's about a buck under our November mention and the lowest total price we've seen. (It's also $4 under the best we could find for a comparable power bank elsewhere.) It charges up to two devices simultaneously.