Sam's Club offers its members the Gentron 8,000-watt Portable Gas Powered generator for $574 with free shipping. (Non-members pay an extra $57.40, so it's better to sign up for a 1-year membership for $45.) That's the lowest price we could find by $250. It features a 10,000 watts of starting power, 8,000 watts of continuous power, push button start, seven outlets, and fuel capacity for 11 hours of run time.