I have one (I'm pretty sure mine is purple though). I don't know that I'd call her a Luna variant as she still has a sun symbol.
I found mine second hand at Goodwill a few months back so I can't add much to where they were sold. Mine has a pink tutu as well, I'm not sure if it's original to her, but it's sewn on & the material is not high quality so it could be original. As it says on the wiki, when you push the speaker under her belly she makes galloping noises and a song plays (song is not very inteligable).
I will pull her out & try to get pictures this weekend. Not sure if there would be a way to take video & upload it here as she is quite funny. Her wings also move, but it's not how wings should move at all
The Celestia next to her is a fashion style so she is very large in relation to g4 ponies.
MLP merch did a series focused on fakies, she is in part 4 about half way down. They are apparently called "My Lovely Merry"
https://www.mlpmerch.com/2017/05/ossie-and-quest-for-worst-mlp-fakies_3.html?m=1