Walmart offers the Sportsman 3,500-watt Portable Gas-Powered Generator for $249 with free shipping. (Amazon charges the same but takes two to four weeks to ship.) That's tied with our mention from last June and the lowest price we could find by $70, outside of the deal below. It runs on gasoline and generates 4,000 peak surge watts and 3,500 rated running watts.

Note: Target has it for $249.99 with free shipping.