That is actually something we civilians don't consider when selecting defensive ammo, availability.
That is why I prefer Gold Dots as I have both the LE and commercial channels to purchase from. I may not like it when I have to pay $1 a round for the commercial boxes, but if I need it and it is the the only box available I can do that.
Though I also have a half a case of the Gold Dot load I like, so it is pretty rare I have to purchase any.