I heard a box from Ansuz at AXPONA 2019 that they advertised as a "Star Grounding" system. I believe it was a Mainz 8 and it cost $20,000 (they now have one that is over $30,000). FWIW, I have been skeptical that these kinds of devices will have a discernable effect on the sound. They plugged their components into a typical Home Depot power strip, played a cut, and then plugged everything into the Ansuz box and played the same cut. The difference in sound was huge. I was sitting there catching flies and I looked around and everybody else had the same look - something between incredulity and disbelief. I am always concerned about expectation bias but everybody in that room heard this clearly. I can describe the sound difference as a blacker background and it wasn't subtle.
I haven't heard the Shunyata system but I would like to hear a demo along the lines of the Ansuz test.
