What can I negotiate on a 2021 MB AMG GT 63 S car when ordering

We drove through the BMW parking lot (small dealership in Dallas) and looking at cars couldn’t tell if they were 40,000 or 140,000. they all looked the same. I looked at a similar BMW and the salesman recommended the M8 Gran Coupe Competition. My son had a M6 coupe for a couple years. It is hard to get my son to look at different cars. He has a couple of friends who have the AMG GT and they say they love it.