N.C. Gen. Stat. § 143-64.22

The rules of the Department of Administration shall include provisions to assure that all consultant contracts let by State agencies shall be made with other agencies of the State of North Carolina, if such contract can reasonably be performed by them; or otherwise, that wherever practicable a sufficient number of sources for the performance of such contract are solicited for competitive proposals and that such proposals are properly evaluated for award to the State's best advantage.