Costco's warehouses present one of the largest and most exclusive product category selections to be found under a single roof.
Guild (verb). an association of men belonging to the same class, or engaged in kindred pursuits, formed for mutual aid and protection; a business fraternity or corporation; as, the Stationers' Guild; the Ironmongers' Guild. They were originally licensed by the government, and endowed with special privileges and authority.
3. institute (n.) an association organized to promote art or science or education