Newegg offers the Rosewill Chic 6,400mAh External USB Backup Battery Charger in Black, model no. PB-C1-6400, for $4.99 with free shipping. That's tied with last month's mention of a different color (which required rebate hassles), $25 off list, and the lowest total price we could find. It features a 1-amp port, 2.4-amp port, and LED status indicator.