I have not had a lot of trouble finding .22 ammo. Most retailers listed here are out, unless you get lucky.
I don't shop Walmart, can't stand the place.
As I travel I get into various gun shops and small town hardwares. I will buy ammo when the price is not scalping.
I find a bit in Farm & Fleet and Fleet Farm as well as similar type of stores. Holiday, gas station,liquor store, gun shop combination stores , one of my favorite type . Even feed stores in the country.
Lately I bought on the net 4000 rounds .22 Winchester Automatic for my 1903. I have recently bought 3000 rounds Remington 5 MM . Both made by Aquilla.