For those commenting about ice cream truck sales, I have seen Good Humor products in stores for decades. According to the below, they gave the trucks up in 1976 to focus on store sales, so they must have been in stores since at least that year:
1976
Good Humor sold its fleet of vehicles in 1976 to focus on selling in grocery stores. Some of the trucks were purchased by ice cream distributors and others were sold to individuals. The trucks sold for $1,000 - $3,000 each.