839.09  Boards not to purchase supplies from members of boards.--No state or county board or municipal board or council shall purchase supplies, goods or materials for public use from any firm or corporation in which any member of such board is either directly or indirectly interested, nor shall any such board pay for such supplies, goods or materials so purchased. Any person violating the provisions of this section shall be guilty of a misdemeanor of the first degree, punishable as provided in s. 775.082 or s. 775.083; provided, that no member of any board aforesaid who shall have recorded her or his vote against such illegal purchase, or who shall have been absent at the taking of the vote thereon, shall be convicted of a violation of this section.