 Today is free Slurpee Day at participating 7-Eleven stores because it's 7-Eleven. The stores have been open for 97 years, but only offering Slurpees since 1966. There have been over 300 flavors offered over the years, but Coca-Cola and Wild Cherry are the top sellers. 37% of us mix the flavors, and the company says they've sold more than 7 billion Slurpees. That's $14 million a month. But today, you can get a small Slurpee free. I'm Bree Tennis.