Furniture Outlet Rapid City SD. Mattress Gallery, Living Room, Bedroom and Kids Furniture. After many years in business, we are still family and locally owned, striving to give you great selection, low prices, and excellent service. We have a variety of kids furniture, beds, bunk beds, bedroom sets, dining tables, dining sets, mattresses, mattress sets, and sofas in our showrooms. We are specialized in residential home furnishings including living room furniture, bedroom furniture, dining room sets, accessories and much, much more.