Gooloo via Amazon offers its Gooloo GP80 12-volt 450-amp Peak Car Jump Starter / 10,000mAh Portable Battery Pack for $49.99. Coupon code "M7NYI5MJ" knocks that to $39.99. With free shipping, that's $90 off and the lowest price we could find. It jumps vehicles with gas engines up to 4.5 liters or diesel engines up to 2.5 liters. Features include two quick-charge USB 3.0 ports, an LED flashlight with SOS and strobe modes, and intelligent jumper cables. Deal ends January 25.