My 99 olds van has a pull down screen in the roof thing, and then under the stereo it has a VCR, YES a VCR hooked to this screen.

Well, I want to sell my van outright and get a little more $$ where can I find a ACTUAL dvd player for a car, like that will hook up in there. Not the ones with the dvd player in the screen like they have now? Any ideas?