Redbox - Quick, Easy, Cheap
If you fly with your portable DVD player or optical-drive-equipped laptop, you can rent a DVD from a Redbox in your departure airport and return it at your destination airport. Just a dollar per movie, and no need to rip it ahead of time.
You can determine at http://www.redbox.com/Locations/LocationSearch.aspx?l={0}&movie={1} if an airport has a Redbox.