S.D. Codified Laws § 32-6B-36.3
The department shall issue metal numerical license plates to an auction agency upon application and payment of a one hundred one dollar yearly fee to be paid at the time of the annual review date for each set desired. Such fees shall be distributed in the manner specified in §§ 32-11-2 and 32-11-4.1 to 32-11-9, inclusive. The license plates shall be numbered consecutively and shall bear as a prefix the number "99." The plates may be issued for a multiple year period. If an auction agency's license is revoked or canceled or the auction agency goes out of business, the "99" plates shall be returned to the department. If any person operates a motor vehicle with "99" plates after the auction agency's license is revoked or canceled or after the auction agency goes out of business, or if the person refuses to return the plates, the person is guilty of a Class 2 misdemeanor.
SDCL 32-6B-36.3