Mo. Rev. Stat. § 640.045

Upon a request from the director of the department of natural resources, the commissioner of administration shall draw a warrant payable to any and all of the directors of the various divisions of the department in amounts to be specified by the director of the department of natural resources, but such amounts shall not exceed the sum of five hundred dollars each. The sum so specified shall be placed in the hands of the director of the relevant division as a revolving fund to be used in the cash transactions involving the sale of items made by that division. All transactions shall be made in accordance with rules and regulations established by the commissioner of administration.