Amzdeal Direct via Amazon offers the Aukey 20,000mAh External Battery Pack Power Bank in White, model no. PB-015, for $39.99. Coupon code "XTY8YKXG" drops it to $34.99. With free shipping, that's $65 off list and the lowest total price we could find. It features LED indicators, 2.1-amp input, 3.1-amp output, built-in flashlight, and is compatible with most USB devices.