When sufficient funds are not available and it is necessary to contract for supplies and services in advance of the fair, the state fair board is authorized to enter into contract which shall contain a provision that such contract shall become effective and binding upon the state fair board only in the event that funds are available to carry out the provisions thereof. All such contracts shall be filed with the department of administration, made a matter of record and paid upon proper vouchers drawn by the state fair board on the state treasurer.