I have seen the .243 (100 Grain) ammo online for $20.69 at Midsouth. I did see some at Wal-Mart weeks ago.
The nice lady at Wal-Mart told me yesterday that just before I got there they had just sold out of .22 CAL. Rim fire Ammo. She says there was a 3 box per person limit and it is wiped out as soon as the manager puts it on the shelf.
Myself I am not in no panic mode on any ammo right now. The ammo that I don't load of course would be .22 Rim fire and 12 GA. ammo. For the past few years I casually bought a brick or case of that ammo from time to time. Since I load my own centerfire ammo and built up a decent supply of components I am good to go for a long time.