Factory Authorized Outlet via eBay offers the Duromax 3,850-watt Dual-Fuel Portable Generator, model no. XP4850EH, for $324.99 with free shipping. That's $5 under our mention from a month ago and the lowest total price we could find by $184. This generator is able to run on propane or gasoline and provides a constant 3,850 watts of power.