S.C. Code § 59-19-80
No teacher or other employee shall be employed or any purchase made except in a duly called meeting of the board, of which meeting each member has been notified in writing by the clerk of the board at least three days in advance thereof, unless a written waiver of such notice of meeting is signed by each member of the board, and unless such action or the memoranda of the terms of any such contract of employment or purchase shall be duly recorded in the minutes of such meeting and approved by the board. No contract shall be entered into with teachers who are under a teaching contract in South Carolina before April fifteenth of each year. In lieu of making a particular purchase, the board may request the Purchasing and Property Division of the Department of Administration to make such purchase.
S.C. Code § 59-19-80