Amazon has the WEN 56380i Super Quiet 3800-Watt Portable Inverter Generator with Fuel Shut-Off and Electric Start (Closed Frame) for $530 with free shipping. 

Includes two three-prong 120V receptacles, one AC 120V NEMA TT-30R RV receptacle, one 12V DC receptacle, two 5V USB ports, a digital load and fuel display.