What kind of power inverter I can get for my car?

Any small inverter will work fine , depending on the draw the appliance uses you may be able to go with a plug into the cigarette lighter type plug or you may have to wire it to the battery directly. Truck stops have a pretty good selection of inverters. I used a 1200watt/2400 peak in a truck with a coffee pot/PS2/microwave/tv VCR/laptop. You will not need anything but like a 200 watt. You can find some good ones on EBAY as well. If all you are using is the Laptop check out the I GO power packs for laptops..It has the universal plugs,house/car/overseas/plane plug, everything you need to power up any where there is any kind of power source.