I've been using Listerine toothpaste for years, all the way back to when it was called Listerine Coolmint Toothpaste. I've always had some difficulty finding the paste form, but right now, I have not been able to find it at all, even in the Walmart Stores. I checked the web sites, and almost all list the product, but say it's out of stock. There are some sites listing it as available on-line, but extremely prohibitive in price. (aka; $21.00 plus shipping, which is more than the it should be) When I bought it last, I bought several tubes, but now I am running out. What's going on?