A general rule of negotiating is never begin a negotiation unless you are pretty certain you know as much or more than the other guy. Anyone visiting here probably has the data they need to already know going in what they OUGHT to be able to get the salesperson down to. If approached with patience, most of the time you'll get that price. But, if not, the other general rule of negotiating is you have to be willing to walk away. If you aren't, you are behind the eight-ball at the word go. That's why they ask questions at the start like, "if I give you a good price, are you prepared to buy today?" If you say yes, they already have you against the wall, because now you've all but given up the fear they have that you'll walk.