Argos are doing a Venturer twin screen DVD player for 59.99, perfect for car use:

Venturer 4.5in Twin Screen DVD Player

  • DVD CD CD-R CD-RW JPEG Kodak picture clip.
  • Reverse, repeat, program and resume playback.
  • Language, sub***le, multi-angle selection.
  • Parental control.
  • Normal widescreen.
  • Colour brightness controls.
  • Built-in speakers.
  • In ear headphones supplied.
  • Headphone jack, one in each monitor and one in each DVD player.
  • Phono jack for AV-in out (lead not supplied).
  • DC jacks input for car-plug adaptor.
  • Monitor-out socket for separate monitor.
  • TV connection via AV lead (not supplied).
  • Built-in din cable.
  • Remote requires 1 x CR2025 battery (supplied).
  • Car adaptor.