Coby TF-DVD7050 7-Inch TFT Portable Tablet-Style Portable DVD Player
Great purchase!
We looked at many of these portable DVD players prior to our driving trip to Disney World. We decided to try this one because it had the exact features we needed (mounted to back of headrest and had mounting gear that covered the buttons so our 2-year old couldn't get into the dvd player).  For a very reasonable price this player did fine with the movies, and came with all the accessories we needed.  It saved our sanity on the way to/from Florida and I would highly recommend it.