Factory Authorized Outlet via eBay offers the DuroMax 3,500-watt Portable Gas-Powered Generator, model no. XP4400, for $249.99 with free shipping. That's $30 under our June mention and the lowest total price we've seen. (It's also a current low by $126.) It produces a 4,400-watt surge and 3,500 watts of continuous power. It runs for up to eight hours at a 50% load.