A. When purchasing steel, every person acting as purchasing agent for any agency, board, commission, department, or other instrumentality of the state or of a parish, municipality, or other unit of local government, including a levee board, drainage district, school board, or special district, shall purchase steel rolled in this state which is equal in quality to steel rolled outside the state, provided the cost of steel rolled in this state does not exceed by more than ten percent the cost of steel which is rolled outside the state.
B. The provisions of this Section shall not apply when sufficient quantities of steel rolled in Louisiana are not available.