sole-source

[ sohl-sawrs, -sohrs ]
/ ˈsoʊlˈsɔrs, -ˈsoʊrs /

adjective

designating a company contracted, without competition, to be the sole supplier of a product or service, as a firm having an exclusive contract for certain military technology.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019