Mattress Giant 6917 S Lindbergh Blvd, Saint Louis, MO63125 Mattress Giant, a national chain, has a location on Lindbergh just east of I-55. It stocks several brands of mattresses,…More including Sealy, Simmons, and Kingsdown. There are frequent sales and specials, and financing is available. Other types of beds, such as futons and daybeds, are for sale also. Mattress Giant also offers free removal of your old mattress.