Most dealers won't negotiate off the GMID price except for maybe dealer add-ons. I know mine wouldn't.
Some dealers for whatever reason just won't deal.
A month ago I tried to buy a 2007 Audi A6 for my wife with a list price of $48,500. I offered them $42k but they wouldn't go a dime lower than $45K. They've called a couple of times but haven't come down on the price. The local Audi and Hummer dealers are owned by the same group.
