At the Baskin Robbins closet to SF (Daly City) a single scoop is $3.59. After tax that's pretty close to $4 for the most chain-est ice cream I could think of. (The DQ doesn't have photos of their menu on Google maps).

Dairy Queen doesn't serve ice cream. Not being snobbish or pedantic here – soft serve is a separate kind of product. Dairy Queen doesn't call it ice cream (probably because it legally cannot be)