CenyOnline via eBay offers this 12,000mAh Dual USB External Battery Pack for $31.50 with free shipping. That's $12 under the lowest total price we could find for a comparable 12,000mAh USB external battery pack elsewhere, although it was available for $1 less earlier today (since expired). It features a Li-ion battery, LED indicator, two USB ports, 3-in-1 USB cable including microUSB, miniUSB, and Apple 30-pin, and more. Deal ends November 11.

Note: It ships from Hong Kong and will arrive in two to three weeks.

Update: The price has risen slightly to $32.80 with free shipping. That's still $10 under the lowest total price we could find for a comparable 12,000mAh USB external battery pack elsewhere