State agencies to which the legislature has appropriated funds for the purchase of health and human services shall solicit proposals to provide health and human services by purchase of health and human services contracts, by publishing a notice requesting the submission of health and human service proposals; provided that a purchasing agency shall not solicit proposals for any Medicaid managed care contract under this section if the anticipated contract sum exceeds $100,000,000 and the commencement date of the contract is after the expiration of the term of office of the head of the purchasing agency. Notice of the request for proposals shall be given a reasonable time before the date set forth in the request for submission of proposals. The policy board shall adopt rules which specify: