TechRabbit offers the refurbished Mophie Powerstation 2X 4,000mAh Portable Battery Pack in Aluminum for $9.99 with free shipping. That's $15 under the lowest price we could find for a new one. It features an LED charge status indicator and is compatible with iOS or Android devices. Deal ends May 21.
Note: A 1-year TechRabbit warranty applies.