Cigarette Lighter Adaptor

Is there a way for me to get an adapter so I could plug my laptop into a lighter in a car?
Will also work well for light xbox360 for my son for making the battery. The car has already taken a scart cable and built in TV?

running about 20-40 $, depending on the voltage

Yes Research 12v inverter

Must be able to find what you need at Radio Shack.

You will need a 12v Power Inverter. There are many choices available.