There is .22lr everywhere if you look - but the days of walking into your local hardware store for some are long over. As DD said, try the ammo crawlers online. You may not always like the price, but there is plenty around to be had.

Are you looking for semi-auto AR-15 conversion / compatable type rounds or all purpose plinkers? If plinker's, there is a good selection on the market now, so why the specific brands? It's a .22...just shoot it with what ya can get IMO.