New price low. Amazon has the Champion Power Equipment 4250-Watt Gas Open Frame Inverter Generator (200954) on sale for $409 with free shipping. 

• 4250 starting watts / 3500 running watts. Up to 22 hours run time on gasoline. 64 dBA noise level
• RV Ready with a 120V 30A RV outlet, plus two 120V 20A household outlets and two USB ports