(c) Neither the commission, the governing boards, nor any employee of the commission or governing boards may be financially interested, or have any beneficial personal interest, directly or indirectly, in the purchase of any equipment, materials, supplies, services or printing, nor in any firm, partnership, corporation or association furnishing them, except as may be authorized by the provisions of chapter six-b of this code. Neither the commission, the governing boards nor any employee of the commission or governing boards may accept or receive directly or indirectly from any person, firm or corporation, known by the commission, governing boards or such employee to be interested in any bid, contract or purchase, by rebate, gift or otherwise, any money or other thing of value whatsoever or any promise, obligation or contract for future reward or compensation, except as may be authorized by the provisions of chapter six-b of this code. A person who violates any of the provisions of this section is guilty of a misdemeanor and, upon conviction thereof, shall be imprisoned in jail not less than three months nor more than one year, or fined not less than $50 nor more than $1,000, or both imprisoned and fined, in the discretion of the court. Any person who violates any provisions of this section by receiving money or other thing of value under circumstances constituting the crime of bribery under the provisions of section three, article five-a, chapter sixty-one of this code shall, upon conviction of bribery, be punished as provided in section nine of said article.