I really don't think the $12.99 deal was an indication that they are going to stop carrying the oil or an attempt to get rid of stock. IMO, it was genuinely a mistake on their part.
The other oils covered in that ad are much less expensive, so the $12.99 price was not so outrageous on those. And when you looked up that deal online it asked you to pick the specific oil you wanted, and TDT wasn't one of the options.
I think it was just a mistake on their part, and a very expensive one at that. I picture a very stressful meeting in a conference room reviewing a monthly report.
The $1 quart deal, yes, I think that is a local move where some specific stores are going to stop carrying that size, but I don't think AZ is planning to discontinue TDT altogether.