I bought my steering wheel new in 2020 for $550 which included the buttons. It made way more sense to do that and then sell my used steering wheel to recoup some of the cost.
Looks like the steering wheel is up to $920 now
https://www.getbmwparts.com/oem-part...el-32307836820
If you must have brand new trims then honestly it still makes sense to just buy the whole unit and then sell your current wheel for a few hundred bucks. Otherwise the economical choice is to retrim by Royal Steering Wheels, and then restore your trims which I've seen can be done by stripping the soft touch coating and spray painting it matte black.