4. The public may also be admitted to a commercial establishment until 9:00 p.m. on Mondays and Tuesdays provided that the establishment principally offers for sale, at all times,
(1) only road vehicles, trailers, boats and farm machinery, or any of these products;
(2) only swimming pools and the equipment necessary for the operation of swimming pools;
(3) only school supplies, provided the establishment is a school cooperative.