Prior to submitting a bid or proposal for a state or local public works project for the construction of a public school facility, if the central purchasing office 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, then the central purchasing office, responsible bidder or responsible offeror may require any bid or offer submitted by a subcontractor or supplier to separately price the specific service, construction or item of tangible personal property.