You should be able to get a 90 day rate/incentive lock especially if you plan to Purchase/Lease via BMWFS.
M550's are in limited supply at dealerships but allocations do not seem to be too challenging to get. I was able to also secure $2k under invoice on an ordered '19 M550 in SoCal as well. Picked her up right around Black Friday in hopes of added incentives (which never came to be)
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