I have one. It is a streaked sport. Not the same. It is also smaller than Aureo marginata. I kind of collect montana varieties.I believe I have 9 varieties/sports. I also have about 30 montana seedlings. Most are green but there are three with a nice yellow color to them.
You are not likely to find "Moonshine"at a local nursery. I purchased mine through a person who is no longer in business. I will keep my eyes open for any sources.