Polaroid PDV-0700 7" Portable DVD Player
great DVD player for the price
This is a great machine for the price.  The screen is a good size and the picture quality is good even when viewed from the side.  The small overall size, even with the battery attached (the battery effectively doubles the thickness) makes it very portable.  It also comes with a couple of accessories not found with the more expensive machines, like a car adapter as well as a 110 plug, and a splitter that allows you to plug 2 sets of headphones in.  The sound is the only place were this machine falls short.  The sound is okay at best with the built in speakers, but any background noise makes it nearly impossible to hear anything from them even with the volume all the way up.  Not surprising since due to the size of the player the speakers are only a little bigger then headphone speakers, but with headphones or portable plug-in speakers the sound is superb.  Besides the sound the only 2 complaints are that you can not control the volume with the remote and that the power switch is too easily turned on by accident (do not travel with the battery attached or you will find you have no charge when it comes time to watch a movie).  The battery lasts 3.5 to 4 hours, long enough for 2 short movies or 1 long one.  So if you are looking not to spend a fortune, nothing else come close in in the under $300 range.