Wallmart here usually gets small quantities of 22 ammo in, the way I understand it as I haven't looked there in a year or so.
When they opened the new cabellas in anchorage last month, wallmart all of a sudden had pallets of 22 ammo on the day of the grand openings in at least 3 of the 4 wallmarts in the state. I found this somewhat an odd coincedence, but it may very well be. It makes a guy wonder if wallmart sits on some of the 22 ammo, just for special occasions.