Since you are buying a used Bimmer at the dealer, they want to screw you. They probably told you that the car was "BMW certified", which doesn't mean dick. Take an advertisement of a similar 99 M3 with you that is at the right price (white out or cut out the location) and show the ad to the dealer. The dealer is only looking for a sucker at that price. Always be prepared to walk away. They won't let you walk if they know you are serious. I had a similar experience buying my used M3 at the dealer in Philadelphia.