Drive-through convenience store Dairy Barn, located at the busy intersection of Hewlett Avenue and Merrick Road, has been a long-standing Long Island shopping institution that offers a quick and easy way to take care of errands. Customers can pick up snacks and groceries without having to leave their cars. Dairy Barn offers typical convience store prodcuts, like coffee, Entenmann's cookies and cakes, potato chips, sodas and beer, as well as groceries such as milk and eggs.