Ah, OK.
In my book this was more a 350€ game.
At least that's what I've paid for mine 2 years ago and the 2 other guys that I know who each own one paid the same kind of price too.
Maybe we were just lucky 
Good luck with the hunt!
they appeal to a young audience. simpsons and turtles are quite popular in the us. not so much over here.
the one on ebay seems to be in great shape.. but for me it is not even close to 500 bucks. no way i would pay as much for it as for a star wars cockpit or two laserdisc games.
700 pounds in rough condition... too much in my eyes... but again... if it is worth it for you then go for it.
