I picked up my 2019 750i today.
Summary below is from info I got in pieces from shopping at a handful of dealers (plus the published Ts and Cs, of course):
CSP incentive on a 2019 750i is currently $13,500 (at least in suburban DC/Virginia, where I got my car). CSP as mentioned upthread doesn’t stack with anything else. This includes CCA.
I thought there was $12,000 in trunk money in the 750, but it’s actually a type of consumer incentive called a “Flagship incentive,” so it didn’t stack with CSP.
So it was better for me to take $12,000 Flagship + $1,000 Conquest, plus $1,500 CCA post-sale rebate than it was to take $13,500 CSP.
The $12,000 Flagship was included in the dealer discount on my paperwork, and I wasn’t taxed on it. Tax was based on an Ohio registration address.