I have see most common calibers (rimfire excluded) on a regular basis when I have looked at the Walmarts I have been to.
Glad you found some .22lr. Still can't find any around Evansville for a decent price. Everything else has come back and is coming down in price.
def easing up - i would guess about 5 years from now we may be back to the "norm"
The ammo case at my local Wal-Mart has a pretty nice selection now. 22LR doesn't last but a couple of hours, but at least it comes in weekly. My buddy has purchased 5000 rounds of .22LR there in the past two weeks alone.
According to this article, the bubble is about to pop:
The Coming Crash in Ammunition Prices | The Truth About Guns
Boy, I hope they're right!