Best Buy offers the Star Wars MimoPowerTube2 2600mAh Portable Battery Pack in several styles (Chewbacca pictured) for $3.99. Opt for in-store pickup to dodge the $5.49 shipping fee. That's the lowest price we could find by $12. It features a micro USB charging cable, LED indicator lights, a carrying pouch, and is compatible with most devices with USB charging capability.

Note: This will ship in a random Star Wars style.