The price of mattresses fluctuates throughout the year. Most of the manufacturers of mattresses bring out new models during summers, and thus the old models of mattresses are discounted in April and May. Additionally, most of the brick and mortar shops offer discounts and sales during Memorial Day, Labor Day, and all other three-day weekend holidays.An online seller of the mattress also provides holiday discounts or sale, but in most cases, they keep fixed prices all over the year.