Everything has been easy enough to find, except maybe 223/5.56. Of course, things are far less complicated when you're stocked up a bit. But anything remotely "high capacity" related is stressed at the moment.
22lr- I'm always sitting on about 8-10K rounds, and bricks show up in town regularly for under $20...but sell out in munutes. For those who are struggling to find 22lr, let's consider this: Usually the ammo market isn't this crazy. And when it's not, you can put away 5K+ rds for under $200. And then- this momentary problem, will no longer be your problem.
9mm, 40sw, 45acp- all calibers I shoot. All can be found here. But again, early bird gets the worm when they show up at Walmart, etc. I picked up a couple 100rd boxes of 9mm and a 555rd 22lr just this morning at WM.
223/5.56- I shoot quite a bit of this, so I like to keep 3K+ rounds on hand. This is a staple round that is not going away, but it's strongly tied to ARs and high capacity/military style rifles so it will constantly be under attack from the Left. This won't change. So if you intend to make this caliber a habit, do yourself a favor and stock up at opportune moments. And "now" is certainly not opportune.
The lesson? Prepare when the time is right. The right time was a few months ago (and for the last three years), but there will be a right time again down the road. For something like 22lr, it's quite affordable for almost anyone to do so. Other calibers may require more discretionary allowances and careful planning, of course. But I'm always surprised at how many people find themselves suddenly desperately hurting for 22lr, when they could have had all they wanted for 4cents a round over the last few years.
Don't pay stupid prices. Things will come around, especially when it comes to staple calibers. And all those listed above are exactly that.