Amazon offers the Gooloo 500A Peak 12000mAh Portable Car Jump Starter Power Bank for a low $39.00 after Coupon Code: "UC7QR7CD"  plus FREE shipping on orders above $49 or with Amazon Prime. Limited time offer. You save 72% off the price! That's the lowest price we could find. This has a 4.7 out of 5 star rating BUT only 50 reviews.

• 12,500mAh battery should be able to fully recharge just about any device
• Ensures total protection against reverse polarity, surges & short circuits
• 2x 2.1A USB ports for rapid charging of portable devices
• This jump starter charger doesn't require a trip under the hood
• Just plug it into your cigarette lighter and wait 8-10 minutes
• Integrated LED flashlight with 3 illumination modes
• Small enough to store in your glovebox