Mich. Comp. Laws § 445.931
Cancellation of certain sales contracts by buyer.
(1) For a sale of goods, services, or memberships whose value equals or exceeds $500.00, if the buyer has been offered anything of more than $25.00 in value in exchange for attending a sales promotion for those goods, services, or memberships, in addition to any other right to revoke an offer, a buyer has the right to…