Two weeks ago, the wally world here had about a half dozen hundred count boxes of .40 S&W WWB, and UMC ammo on the shelf, and several boxes of higher end SD ammo too. I should have bought a bunch of it while I could. It's all gone now, and they don't know when they'll get more.
I finally found some UMC online, or at least they said it was in stock, and they took my order, promising delays.
BTW, I just recently lucked into a .40 M&P Shield for MSRP. My first .40. Sweet gun!