Check in the "is your SD loose" topic. Someone posted it on S&W fb page and they confirmed it in their response to the person's post. This was posted after I posted what I saw on fb:
"Smith & Wesson Corp. ‎Brad Paynter - you are correct. I just looked at the 2012 price list and the SD9 and SD40 are no longer listed meaning...out of production. As for why? Lots of models ome and go, it all comes down to some top secret magic formula that only finance people pretend to understand. But no worries, if you own one, we'll cover it under the Lifetime Service Policy. And if you want one - I'm sure they are available at retail."