Supertech is a Walmart brand, built to their specs. The filters were just relabeled Champ Labs filters. For some reason, probably price and the fact that Champ and Fram are now one company, they switched to Purolator, getting a national brand at what is probably a very good price.
The oil is packaged by different suppliers in different regions, but I see no reason for Supertech oil to go away. The way Walmart structures their deals and buys in such huge quantities, they will always get their own branded product cheaper than a major brand motor oil.