S.C. Code Ann. § 59-31-240

No pupil in the public schools of the State shall be required to pay any larger amount for the use of the books than authorized by Section 59-31-210 nor to buy outright or otherwise acquire any textbook. But any pupil may purchase, if he so desires, the books to be used by him, in which event no rental fee will be charged to such pupil. The State Board of Education shall make proper arrangements for the sale of textbooks to those pupils who desire to purchase them, and such textbooks shall be sold at cost plus actual expenses.