There is a way to Save Negotiating Hassle...
But you need two things to work in your favor.
First, you need to know a GM Employee. Ask them to get you an In The Drivway" certificate. It will you to buy at Supplier Price, but also allows you to combine GM Card earnings using the old cards, if there is an allowable redemption. A GM Employee, or GM Supplier can only use GM Familiy Crd earnings, at 1% as opposed to 5% for Blue, Copper, Plat,and Gold cards. Not all units are eligible for earnings redemption. Go to gm.com, and check out current offers, then card services icon.
Second, your dealer must be willing to accept the certificate. If they have the unit you want, and they say "No," just use the standard "well so and so will, but I'd rather buy it here."
Hope it helps somebody out, also works well towards the end of the month, push the sales a little more.
Troy, if you're reading this, call me, I'm still waiting.....
Steve