Groupon offers the PowerIt 36,000mAh Portable Jump Starter
for $299.99. Coupon code "VISA5" cuts that to $284.99
. With free shipping
, that's $65 off list and the lowest total price we could find. It features a peak current of 24-volts, 8-in-1 laptop charger adapter, LED emergency lights, built-in USB port, and DC output port.