Ortho Mattress Gallery 27995 Greenfield Dr, Laguna Niguel, CA92677 Ortho Mattress Gallery is the largest mattress retailer. Located in the Center Rancho Niguel next to Loehmann's, Ortho…More Mattress Gallery offers a wide variety of mattresses at factory prices. Name brands include Ortho, Sealy, Stearns & Foster and Simmons. Ortho will delivery the mattress to your home, set it up and remove your old mattress. It offers a comfort guarantee and warranty. Free financing is available. See ads for weekly sales.