Two of the more well known, at least to me, slushy drinks that available all year round but are most welcome during the summer months. Slurpees can only be found at 7-11 convenience stores. Icees can be found at Wal-mart and other locations. The company that makes the Icee machines also make the Slush Puppy machines as well. Both beverages are icey airy confections that come in a wide variety of flavors. Although I think Slurpees have a greater selection of tastes to choose from.
In looking up these products, it seems the credit for the invention of both products goes to Omar Knedlik. Apparently, he had kept his sodas in the freezer and customers enjoyed the consistency when they purchased the partially frozen drinks. He came up with a machine that would keep the drinks in the semi frozen state. 7-11 bought the machine and gave it the Slurpee name for the sount that it made when imbibing. All this info is attributed to Wikipedia but some information seems to be conflicting