As one of its daily deals, That Daily Deal offers the Scosche GoBat 3,000mAh Wall Charger / Portable Battery Pack in assorted colors for $8.49 with free shipping. That's the lowest price we could find by $12. It's compatible with iOS and Android devices and features a foldable AC plug. Deal ends December 22.
Note: This item ships in random colors.
With these companies, it might be easier than you think to negotiate your monthly bill down.