Cal. Bus. & Prof. Code § 17537
(c) It is unlawful to notify any person by any means that he or she will receive a gift and that as a condition of receiving the gift he or she must pay any money, or purchase or lease (including rent) any goods or services, if any one or more of the following conditions exist:
(4) The majority of the gift offeror’s sales or leases within the preceding year, through the marketing channel in which the gift is offered or through in-person sales at retail outlets, of the type of goods or services which must be purchased or leased in order to obtain the gift item was made in conjunction with the offer of a gift.
This paragraph does not apply to a gift offer made by a general merchandise retailer in conjunction with the sale or lease through mail order of goods or services (excluding catalog sales) if (A) the goods or services are of a type unlike any other type of goods or services sold or leased by the general merchandise retailer at any time during the period beginning six months before and continuing until six months after the gift offer, (B) the gift offer does not extend for a period of more than two months, and (C) the gift offer is not untrue or misleading in any manner.
(d) The following definitions apply to this section: