preferred vendor
noun[C]
COMMERCEukus(alsopreferred supplier,approved vendor)amanufacturerorsellerthat has acontinuingarrangementtoprovideabusinessororganizationwithproductsorservices, often at areducedprice:
It is notuncommonforfirmsto re-evaluatetheirpreferredvendorlistevery three to fiveyears.