When buying a new bed and mattress set, double-check to make sure you need the box spring. Many modern bed designs are "platform style," which means they are designed to hold a mattress without the support of an additional box spring. But many mattress dealers automatically include the price of a box spring or foundation support with the cost of the mattress. By buying a “mattress only” bed, you won’t be stuck trying to give or throw away an unnecessary foundation support. Plus, buying only a mattress can result in savings in your overall purchase price.