power-innovation via Amazon offers the Maxboost Pulse 10,000mAh External Battery Pack with Digital Display in Black for $38.95. Coupon code "PULSEJAN" drops it to $29.95. With free shipping, that's $70 off list and the lowest total price we could find, although we saw it for $5 less in November. It's compatible with a range of devices and features a digital display and two USB ports.