I think the grill star/barrel assembly is about $1,200 these days...or close to it. Protect your star!
There are a variety of means to reproduce this with varying results--the challenge is it would be hard to do it "non-commercially". Commercially, it would have to be done on the sly, as nobody wants the DBAG lawyers after them. I saw some stars like Joe, for the 113, in brass-but they needed a lot of work. NLA, as are the repro wheel covers with the star...
Maybe today, or in the near future, with CAD systems coming down stream, and 3D printers, we might have something someday, that people can do for themselves. Who knows...