look at vehicle history reports like car fax.com to see about the vehicle history and then try to get a true market value of the car you are looking at by checking out the edmunds.com web site. Then you can negotiate the price down with the facts. Keep in mind that many dealers charge a transaction or processing fee for every car sold so you need to deduct that from the asking price before you even start !. Could be anywhere from $199 to $499 beware. Good Luck