BavFan, research before I purchased my X3 indicates that BMW has a 9.89% markup (in Canada).
Donno if that helps but I didn't sweat 1/2% additional discount and I went with the sales guy (CA - contract advisor in BMW speak) that I liked. The dealership was out of my way but like I said, I liked the guy.
The difference between 6% and 6-1/2% discount on a $60,000 X3 is $300.... that's 3 tanks of gas.
You could spend a couple hours to weasel that 1/2 point but what is your time and stress worth? Just saying.