US-Teck through eBay has the 1byone 9,000mAh 12-volt Lithium Jump Starter Emergency Portable Battery Pack, model no. OUS00-0465, for $29.99 (59.99 – 30 instant savings) with Free Shipping for a limited time.

The 1byone portable battery is capable of jump starting a vehicle up to 4.7L (12-volt) numerous times on a single charge. It has a 450A peak current. There are safeguards in place, like reverse polarity protection and shock-proof technology. It also features a digital display, USB port for charging mobile devices and built-in flashlight.