Where I live there haven't been 7-11s in years. They got bought out by Circle K (essentially the same thing for those who have never seen them) and Slurpees and Big Gulps became nothing more than a memory.
There are three major Icee distributorships in North America that service everywhere in the states that sells Icee products (machine maintenance, flavored syrup supplying, etc). Strangely enough, one of those three distributors in located in northwest Louisiana. Slurpees may have disappeared but it's unlikely Icees will ever be gone from this region.