Where did the people in the thirteen colonies shop at?
The modern idea of "stores" did not exist at that time. They had individual places like a butcher, a baker, a person who took care of horses (I can't think of the word for that), specialty shops, they would not have had a supermarket nor a grocery store. They raised their own food, and took care of their families mostly with what they could make themselves. Even things like soap were made at home.