Daily Sale offers the Iogear GearPower 2,400mAh Mobile Power Bank, model no. GMP2K, for $9.99 with free shipping. That's a buck under our November mention and the lowest total price we could find by $6. It measures just 0.4" thick and features a 1-amp output. This power bank is designed for smartphones and MP3 players.
Note: The countdown timer on the product page does not reflect an actual expiration time and resets daily.