I'm sure people will reply with much better advice but I would advise doing your research on any car you're interested in buying. See how many of said car are available and see what the average price is for the milage on the cars, that will give you an idea of a fair price. Be very wary of a used car that doesn't have a log book to show it's service history and always be prepared to walk away if you're not getting the deal you want.