S.C. Code Ann. § 2-3-70

Except as provided for in SECTION 2-3-110, all supplies and equipment for use of the General Assembly shall be purchased only upon authority of either the Clerk of the Senate, Clerk of the House or the Legislative Council for the respective branches of the General Assembly, and that a copy of such written authority shall be attached to all warrants in payment thereof before such warrants are honored by the Comptroller General.