Walmart offers the Wen 1,500-watt Portable Generator, model no. 56180, for $169.98 with free shipping. (Amazon has the same price.) That's the lowest total price we could find by $3. It is CARB compliant, produces an 1,800-watt surge and 1,500 watts of continuous power and features two AC120V three-prong wall outlets and one cigarette-lighter-style 12-colt DC outlet.