Fancy a nice day out beside the seaside?
There is a shop called 'Snoopers Paradise' in the north lanes in Brighton. This usually has an array of retro gear. I don't mind popping in there and reporting on what can be lurking. Last time I did see some sort of Atari incarnation.
Throughout the years I have seen N64, PSX Megadrive, 2600, SNES, NES, Colecovision, Intellvision etc there. They usually come bundled with games.
http://www.qype.co.uk/place/134571-Snoopers-Paradise-Brighton
There's a lots of other stuff there too such as old phones, retro action figures and second hand clothes.
Cheers
Aaron