Audiovox D1812PK 8-Inch Portable LCD DVD Player with Car Kit
A MUST for trip w/ small children
We bought this unit from Sam's Club right before a trip to Disney World. (8 hours in the car with a toddler--eek!)  However, it was/is perfect!  We still use it for trips around town when we're in massive traffic or our son is being really fussy.  The case that keeps the dvd player on the back of the seat needs a little work, but we figured out a way to make it work for us.  Also, the remote doesn't work well, but we don't really need to use it as a DVD usually lasts long enough between stops.