Lowes offers Kobalt Dual Fuel 6,830W / 5,500W Portable Generator for $449 (reg $749) with free shipping.

Product Description:
Ideal for powering DIY projects, emergency backup power during an outage or for use at outdoor events, the Kobalt 5500 Dual Fuel portable generator provides power and versatility when and where you need it.  Featuring Dual Fuel functionality, this generator is capable of running on either gasoline or an LP gas fuel source with the simple turn of a dial.  Featuring a durable steel tube frame and a compact design with integrated wheels and handle that makes transportation easy while onboard COsense® technology provides powerful protection from hazardous carbon monoxide. The 298cc OHV engine provides consistent power for multiple applications while a large-capacity fuel tank delivers up to a 9.5 hour runtime at 50% load (Gas).

• Dual Fuel – Runs on gasoline or Liquid Propane fuel with a convenient switch to seamlessly move between fuel types to prevent unit shutdown.
• 9.5-Hour Runtime when running on gasoline and 50% of power is being used; propane runtimes will vary depending on LP tank size and amount of power being used.
• Easy-to-Use Recoil Start: Start your generator with an easy pull
• Fuel-Efficient OHV Engine - 298cc engine with EFI technology optimizes fuel efficiency and requires less maintenance.
• LP connector hose Included – 4ft LP tank connection
• Handle & Wheel Kit with Durable steel tube frame - Ergonomic handle and never-flat wheel kit included for portability with steel tube frame for added durability and strength.
• Covered outlets provide added protection from the environment and rugged working conditions.
• Low-oil level shutdown automatically safeguards the engine from damage.