After reading this thread I went to my local Wally World to stock up on a few filters in case there were eliminating them. There were absolutely NONE on the shelf. There happened to be an automotive employee right there so I asked where the ST filters were. His reply was that Walmart corporate called for them to be removed. He said all stores should have taken them off the shelf and they were being replaced with Purolater brand filters. They previously did not carry Purolater. I did see a selection of Purolater filters o the shelf and they were all priced at $3+ (give or take some change) but they did not have the correct one for the C14 or either of my 2 vehicles. So take that for what it worth, that is what he told me.
I haven't been able to find T6 at WalMart lately, but the local ones all still seem to have Rotella T. Still about $13/gallon in AZ.