Just took a look and I can find talk about it in 2014 but it's dead air after that, I'm 99% sure I saw a press release probably around that time with a picture of one, I believe VFC was making it. It was around the same time as the Glock 42/43's were being made and getting press.
But right at the moment I can't find that they actually hit the market, but since it's a licensed deal it's very possible that S&W shot down the idea or something between the release and distribution.
So bad news is I don't have a clue if it exists;) But I remember seeing it and thinking "hey that would be a neat training option"
Luke