Aukey Direct via Amazon offers the Aukey 20,000mAh External Battery Pack Power Bank in Black or White, model no. PB-N15, for $35. Coupon code "Z56QQZKT" cuts it to $26.99. With free shipping, that's $18 off list and tied with our mention from three weeks ago as the lowest total price we've seen. It features LED indicators, 2.1-amp input, 3.1-amp output, flashlight, and is compatible with most USB devices.