http://smith-wessonforum.com/smith-wesson-semi-auto-pistols/462525-10mm-mags-i-rolled-my-own.html
Solomon, you have to check back occasionally. They currently list them for sale. S&W customer service also told me that they (S&W) will be getting some more very soon.
I don't know who is making them but they are becoming available again.
This was a response to this thread. wonder if this will happen? Be nice if true