I know they have been rare as proverbial hen's teeth.
It's why I've started telling folks to go to places like Osage, and Midwest Gun Works, or even Sig's website. Making a "Notify Me When Available" entry, likely gives Sig an idea of the desire of customers to buy more, so they have another production run made.Here’s the 9mm link...
.. .they have 357Sig too...
Not cheap...I got 6...That gives me 11 9mm mags for 2 guns...and free Priority Mail shipping for 3 or more.
You have to wonder how these just show up out of the blue when nobody is making them.