My Walmart store has exactly 9 each 30CAL Ammo cans of XM193 of 5.56mm at $199 apiece. Bunches of 7.62X39 in all makes there too. They’ve been in the case for about 2 weeks.
Every other caliber, EXCEPT 38, 38SPL, and 357 Magnum AND 22LR and 22MRF is in strong supply, too.
Our Walmart is the red headed step child. The only 7.62x39 they get in is Tula, which is hit and miss. I was told that the reason was our distribution comes from Indiana and we essentially get the leftovers. 5.56 is in regularly @10.99 (too much for target rounds IMO) but WM limits purchases to 3 boxes total of anything.
For the most part I have had to use gunbot.net and ammoseek.com to find what I want when I want it. The only 38spl locally is high end SD stuff. Practice grade has to be ordered and it’s pricey. Ditto for 9mm and 380 auto.