Mintek MDP-1770KIT 7-Inch Portable DVD Player Kit
Great for the 6 times it worked
I loved this DVD player when we bought it.  It works well, is reasonably priced, has a handy-dandy carrying bag that hooks to the back of the carseat, and had pretty good sound and picture.  Unfortunately, based on our own experience and that of the other users, its expected shelf life is probably 10 uses or less.  We used the player only for long road trips, and were careful not to damage it or use it roughly.  Between trips, it was carefully packed away in a closet.  After using it a half-dozen times, the picture stopped working, and only displayed black.  At roughly $25 per use, we would have been better off renting one each time we needed it.