Factory Authorized Outlet via eBay offers the DuroMax 8,000-watt Portable Gas Electric Start Generator, model no. XP10000E, for $649.99 with free shipping. That's the lowest total price we could find by $246. It features 8,000 watts continuous (10,000 watts peak) output, a 16-horsepower 420cc engine, electric start, 10 hours of runtime at 50% load, 8.3-gallon fuel tank, and five outlets.