Amazon offers the Champion 2,000-watt 4-Stroke Gas-Powered Inverter Generator, model no. 73536i, for $505.52. Clip the 20% off coupon on the product page to knock it to $404.42 at final checkout. With free shipping, that's the lowest total price we could find by $96. It weighs 48 lbs., features 2,000 watts max output (1,700 watts rated), and can run up to nine hours on a full tank of gas at 25% load.