Other World Computing offers the Just Mobile Gum++ 6,000mAh Portable Power Bank in Gray, Silver, Gold, or White for $35 plus $2.49 for shipping. That's $13 under our mention from two weeks ago and the lowest total price we've seen. (It's a current price low by $23.) It can charge a variety of devices via its 2.5-amp USB port. Deal ends January 25.