power-innovation via Amazon offers the Maxboost Pulse 10,000mAh External Battery Pack with Digital Display in Piano Black for $38.95. Coupon code "WOOTBATT" drops it to $27.99. With free shipping, that's $11 off and tied with our mention from two weeks ago as the lowest total price we could find. It's compatible with a range of devices and features a digital display and two USB ports.
eCase via Amazon offers Prime members the KMASHI Mini 2,800mAh External Battery Pack with Light in Black or Hot Pink, model no. KMAX-807, for $9.79 with free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise, it adds $5.22.) That's $16 off list and the lowest total price we could find. It's compatible with devices that charge via USB and purports to provide 1,000 charge/discharge cycles.