There is .22LR on the shelves at Walmart about every 2 weeks out here. Usually lasts for a few days with no limit on purchase amount at about $.08/rd. It's almost always the Federal Automatch 325 boxes or little 50rd boxes of CCI. Once, they had half of a display case (easily more than 50k rds) 50rd boxes of CCI "standard velocity" (which is subsonic in most pistols) so I bought a bunch of it. Much cheaper than ammo that is labeled "subsonic".

Unrelated: There actually are a lot of gun owners in this part of CA. Not sure whats going to happen now that the bullet button will be outlawed within a few months.... I can't imagine how they will deal with an estimated 80k+ legal AR-15 owners... And that doesn't include the 145k+ already registered "assault weapons" in CA.