One of my local neighborhood convenience shops is a place I frequent with or without it being an assignment. This particular chain has a very popular section of flavored iced teas adjacent to the soft drink fountain. Probably half the people in that store are getting one or the other or both, regardless of whether it's a MS.
Things I have purchased at these types of shops include matches and fly swatters.
Those kinds of purchases tend to happen when I have 5-10 convenience shops in one day, and I've already gotten a couple of drinks, protein bar, sunflower seeds, nuts, etc.