Costco Hearing Aid Centers, a part of Costco Wholesale Corporation, provides a range of hearing solutions. It conducts hearing tests and provides various products. The center also offers hearing aid checkup services. Costco Hearing Aid Centers provides open-fit and behind the ear hearing products. It has locations in Washington and Idaho. With sales revenue of more than $60 billion, Costco Wholesale Corporation is one of the leading, international chains of membership warehouses in the world. Operating under the Costco trade name, its warehouses offer branded merchandise at lower prices than conventional wholesale and retail outlets. Its warehouses carry groceries, appliances, television and media items, automotive supplies, tires, toys, hardware, sporting goods, jewelry, watches and cameras.