Cal. Bus. & Prof. Code § 17538.8
Any advertisement that offers free or discounted transportation or certificates to obtain transportation and that requires the consumer to purchase accommodations through or from a particular source, or any advertisement that offers free or discounted accommodations or certificates to obtain accommodations and that requires the consumer to purchase transportation through or from a particular source, shall set forth in close proximity to each reference to free or discounted transportation or accommodations, in a size and prominence no less than the largest print in the reference, the total price that shall be paid by the consumer for the combination of transportation and accommodations. If the advertisement is oral, the total price shall immediately precede or follow each description of the free or discounted transportation or accommodations.
Ca. Bus. and Prof'l. Code § 17538.8