Max Tool Sales via eBay offers the DuroStar Gas Powered 4000 Watt Portable Generator, model no. DS4000S, for $239.99 with free shipping. That's $20 under our mention last week and the lowest total price we could find by $50. It produces a 4,000-watt surge and 3,300-watt running power. It runs for up to eight hours at 50% load and features a 4-gallon fuel tank.