Harbor Freight Tools offers the Predator 1,600-watt Portable Gas Inverter Generator for $699.99. Coupon code "51920568" cuts the price to $399.99. With $6.99 for shipping, that's $300 off and the lowest total price we could find. It features 2,000-watts peak power, two grounded outlets, and up to 6.5 hours of operation at 50% capacity.