Having a generator is always a good idea. You never know when the power will go out or how long it will be out. Right now eBay is offering this DuroMax XP4850EH Hybrid Portable Dual Fuel Propane / Gas Camping RV Generator for $324.99 (was $999.99). This is a great price for this generator!
If you want to compare price on Amazon, you can find the same one here.