My local Carquest store stocks Wolf's Head 30W non-detergent oil that we use for our air compressors. They have had the stock forever, as it's not really in much demand except for air compressors, basically.
I did use some in a pinch as premix oil in an antique Lawn-Boy I was restoring. I figured it's probably the closest thing to the "MS" grade 30W oil they recommended. My shop is about 10 miles from civilization, and I didn't feel like running to Wal-Mart for 2-cycle oil at midnight just to make sure the engine fired up. Aside from smoking like a freight train, it ran great on it!