Gooloo via Amazon offers the Gooloo 450A Jump Starter Portable Power Bank for $49.99. Coupon code "Y4FZMEXZ" cuts it to $38.99. With free shipping, that's $11 off and the lowest price we could find. It jump starts gas vehicles up to 4-liters, and diesel vehicles up to 2.5-liters and features a USB port and an LED light. Deal ends December 8.