My local Palmetto Armory didn't have near the 9mm selection they usually do, but still had a lot of Blazer, as well as high end SD cartridges. No .22 bulk, though. What with the new year, and pending/possible AWB, everybody is buying everything in sight. It will just take a little while to get new shipments in, so if I were you, I'd buy the 9 when you can, and then get ammo when you can, resorting to the Net if necessary, which often has better prices anyhow.
Believe me, you will NOT be happier a month from now if you can find all the 9mm ammo you want, but can no longer find your M&P.