Like DancesWithGuns, dispite having four Super Walmarts within 30 minutes of where I live N.E. of Houston.....really have a problem remembering when any of them had 22 ammo. Do recall a clerk of one of the Walmarts I visit more often responding to my question about, "you ever get in 22 LR ammo in stock". Her answer was yes. My next question, "Are the same guys always buying it?" She didn't give me an answer, kinda just walked away.
But, other places that sell ammo in my area have had some kind of 22 ammo in stock for a number of months now. Might not be what I'd like to buy for the 22 rifles I like to shoot, when it comes to accuracy, but its 22 ammo and some of it is reasonably priced.
