No preference provided for under Article 1 shall be granted unless the lowest responsible bid or proposal received is in excess of $100,000: provided, further, that if a state awarding authority has reserved the right in its Invitation for Bids or Request for Proposals to award multiple contracts on the basis of individual items, no preference provided for under Article 1 shall be granted for the purpose of a multiple contract award unless the lowest responsible bid or proposal submitted for a particular individual item or group of items that is the basis for contract award, is in excess of $100,000.