Was in staples truro today. They had a big stack of prism portable dvd players with 7" screens for £40. Don't know if all stores are doing them but struck me as a good deal. Had a "get it before its gone" sign. Included headphones, remote control and a bunch of movies (including donnie darkoe and transformers the movie) and cables etc. Anyway I've lifted the description below from amazon who seem to do the exact same thing and I can see a bunch of them on ebay.
The compact Prism 7 Portable DVD Player comes with eight movies, to keep the kids entertained on those long journeys. It holds one disc at a time to watch your favourite DVD and has a Composite of 1. It also has analogue audio and a headphone jack output to listen to movies in your own private space.
# Donnie Darko
# My Little Pony The Movie
# Help I'm A Fish
# Car Trouble
# The Water Babies
# Black Beauty
# 7" screen portable DVD player
# Rechargeable battery pack
# In-car charger
# AC mains adaptor
# AV lead for another screen or games console
# Infra-red remote control
# Soft carry case -- doubles up as the in-car headrest hanger so that rear-seat passengers can view