With the approval of the office of management and budget, any department, agency, or institution of the state currently leasing or renting office equipment under an agreement that is     convertible to a rental-purchase or similar agreement, upon certification to the office of management and budget that conversion of such leasing or rental agreement to a rental-purchase or similar agreement is to the financial advantage of the state and does not commit the state to payments thereon beyond the biennium for which funds are available, may convert such rental or leasing agreement to such rental-purchase-type agreement.