Hisgadget Inc. via Amazon offers its Prime members the Intocircuit Power Castle 11,200mAh Dual USB External Battery Pack and Charger for $29.99 with free shipping. That's $30 off and the lowest price we've seen. (Non-members can spend $35 or more to qualify for free shipping; otherwise, shipping starts at around $5.55.) It's compatible with iOS devices and most smartphones and it functions as an external battery and USB charger.
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.
Amazon offers the Maxell AA Alkaline Battery 48-Pack, model no. 723443, for $11.57. Add it to your cart via Subscribe & Save and it falls to $10.99 with free shipping ($0.23/battery). That's the lowest total price we could find by $24, although we saw it for $3 less in November.
Be sure to cancel Subscribe & Save after your order arrives, or you'll be billed for subsequent shipments.
Newegg offers the iCanonic iCruiser 12,000mAh Dual USB Power Pack, model no. ICR-12000B, for $28.99 with free shipping. That's $3 below our December mention and the lowest total price we could find by $6. It features dual USB ports for simultaneously charging two devices, three adapters, and a carrying pouch.
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.