Walmart had them, along with Diet Strawberry and Diet Blueberry. When I realized that their stock wasn't being replenished, it seemed these have been discontinued - shame that, since I really like the blueberry flavor. The only ones left were the cherry flavor, so I cleaned them out - 5 cases, so I have enough to last awhile, along with my one remaining case of blueberry.
Interesting. I had never even heard of these. Some products seem to don't get very much marketing behind them. If they're slow sellers and being discontinued, maybe that's why.