Home Depot offers the the Sportsman 6,000-watt Dual Fuel Generator bundled with a 12-volt Battery, Oil, and Cover for $669. Opt for in-store pickup to dodge the $55 shipping charge. That's the lowest total price we could find by $30. It can run on gasoline or liquid propane gas and features a 13-HP engine with 7,500-watt peak rating, automatic voltage regulation, and low oil shutoff.