Prior to submitting a bid or proposal for a state public works project, if the state purchasing agent, or a responsible bidder or responsible offeror determines that there is only one source for a specific service, construction or item of tangible personal property that is required in the specifications, the state purchasing agent, responsible bidder or responsible offeror may require any bid or offer submitted by a subcontractor or supplier to price separately the specific service, construction or item of tangible personal property.