Welcome To The Mattress Clinic We are the largest dealer for Diamond Mattress® and the only GhostBed® dealer in Oklahoma. We have a wide selection of mattresses ranging from affordable to premium. We also have the largest selection of massage chairs in our showroom at the Moore location. At The Mattress Clinic, we believe your health and wellness is the top priority. Our mission is to help you find the perfect mattress or massage chair to improve your sleep and overall health read full review »