Same around my area. For some reason it didn't sell here and the Wal Marts that did stock it still have most of their original stock. It is not selling at $20.00. Our stores, that have any at all, are selling Castrol Syntec for $22.00
In my part of the country, word of mouth can make or break a product and it only takes a very few mouths. Our stores, including most auto parts stores, don't carry 0W-anything and no XW-20.
I took my pastor to a local, the biggest, best known, lube, tires, and AC place to get tires rotated and balanced. What I tend to generalize as a "little old lady" came in with a very new, shined like a mirror, Chrysler. The manager evidently knew her as she greeted him by first name. She instructed him to change the oil and rotate the tires and she gave very specific orders, "and don't put any of that 0 junk or 20 junk in my car.("junk" cleaned up) I couldn't help but laugh.
Castrol must have a fortune tied up in advertising. Edge must be doing good somewhere around the country.