Costco.com offers its members the Cummins Onan P5450e 5,000-watt Portable Generator for $799.99. (Non-members pay $40 more.) With free shipping, that's a $200 cut and the lowest total price we could find. Sales tax is added where applicable. Features include a 6-1/2-gallon fuel tank for up to 9 hours of continuous operation, 13HP, 4-stroke engine, circuit breaker protection, and more. Deal ends October 18.