S.D. Codified Laws § 37-5-12.1
For the purposes of §§ 37-5-1 to 37-5-12, inclusive, the term, dealer, means any person, or the person's successor who, for commission or with intent to make a profit or gain, sells, exchanges, rents, leases with the option to purchase, or offers or attempts to negotiate a sale or exchange any merchandise as defined by this chapter from manufacturer authorized facilities in this state, or who is engaged wholly or in part in the business of selling any such merchandise from manufacturer authorized facilities in this state. The term does not include any person with total annual gross sales in this state and elsewhere of one hundred million dollars or more of industrial and construction equipment, attachments, replacement parts, and service related to the equipment, from any one manufacturer or supplier of such equipment.
SDCL 37-5-12.1