Sunvalleytek via Amazon offers the RAVPower Deluxe 14,000mAh Portable External Battery in Black or White, model no. RP-PB13, for $29.99 with free shipping. That's $5 under our August mention and the lowest total price we've seen. (It's a current price low by $5.) The battery pack features a built-in flashlight, auto-off, and compatibility with a wide range of devices (including the iPad, iPhone, and Android phones and tablets).