S.C. Code Ann. § 35-2-211

As used in this article, "market value", when used in reference to shares or property of any resident domestic corporation, means the following: (1) In the case of shares, the highest closing sale price of a share during the thirty-day period immediately preceding the date in question on the composite tape for New York Stock Exchange listed shares, or, if the shares are not quoted on the composite tape or not listed on the New York Stock Exchange, on the principal United States securities exchange registered under the Exchange Act on which the shares are listed, or, if the shares are not listed on any such exchange, the highest closing bid quotation with respect to a share during the thirty-day period preceding the date in question on the National Association of Securities Dealers, Inc., Automated Quotations System or any system then in use, or if no such quotation is available, the fair market value on the date in question of a share as determined by the board of directors of the resident domestic corporation in good faith. (2) In the case of property other than cash or shares, the fair market value of the property on the date in question as determined by the board of directors of the resident domestic corporation in good faith.