Factory Authorized Outlet via Rakuten Shopping offers the DuroMax 3,300-watt Portable Gas-Powered Generator, model no. XP4000S, for $249.99. With free shipping, that's $10 under our June mention and the lowest total price we could find by $30. It produces a 4,000-watt surge and 3,300-watt continuous power. It runs for up to eight hours at a 50% load. Deal ends August 20.