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There's a product made by Belkin called AC Anywhere that will allow you to convert a cigarette lighter socket to an ac outlet. It can be purchased just about anywhere: Radio Shack, Ebay, Buy.com. Hope that's what you're looking for.
its called a power inverter. Don't get the cheapes you see and try to match the inverters power rating to the power rating of the componants you plan to install.
Some inverters I've seen have a detachable cigarette lighter so that it may be wired straight to the batt or "run" power source. If not, just cut off cigg lighter adapter. Just connect to something behind the dash with power when the car is in run and ground out. If connecting straight to battery, install inline fuse. Mount inverter under the pass seat or dash.