Cunningham's Drug in Grinnell, Iowa, had a full soda counter in the back (sandwiches, sodas, sundaes, etc.). I still have my new-student coupon. Their specialty was the Candyland Sundae: Vanilla ice cream, marshmallow topping, and Spanish peanuts, and allegedly a secret ingredient. The retired farmers used to hang out there all the time.
Wal-Mart put them out of business in the late 1990's, sadly.
There was also Star Drug in Galveston, but it burned about 10 years ago and hasn't been completely rebuilt. They did it all: sodas, phosphates, lunch, floats. It was great.
What exactly is an "egg cream"? I don't think we have those in this part of the country.