Check out this Briggs & Stratton 30651 P2200 PowerSmart Series Portable 2200-Watt Inverter Generator with Parallel Capability $454.30 (Retail $628.47).
Now this would come in handy for tailgaiting, camping or electricity outages (of course could only hook up maybe a heater or fan)!
-Produces less than 3% total harmonic distortion making it safe for laptop computers, TVs and game systems
-1-gallon fuel tank for up to 8 hours of continuous operation at 25% load, USB port allows charging of portable electronics in order to stay connected
-Parallel connector port allows connection between 2 units for more power
-At 59dB operating volume, it's quieter than a normal conversation (Sound levels may vary based on proximity and location; measured at ¼ load at 7 meters from control panel side)
-Can not be shipped to the state of California