24 Pa. Stat. § 10-1008
No executive director of the intermediate unit, district, or assistant district superintendent or assistant executive director of an intermediate unit shall receive any compensation for services rendered in connection with the public schools under his jurisdiction except the compensation herein provided. No executive director of the intermediate unit, district, or assistant district superintendent or assistant executive director of an intermediate unit who is engaged as such, or any person who is an applicant for such position, shall be an agent for, nor shall he be in any way financially interested in, the sale or adoption of any book or books or supplies in the county or district in which he is engaged, or in which he is an applicant for such position.
24 P.S. § 10-1008