"Cash price" means the cash price stated in a retail installment contract for which the seller would sell or furnish to the buyer and the buyer would buy or obtain from the seller the goods or services which are the subject matter of a retail installment contract if the sale were a sale for cash instead of a retail installment sale. The cash price shall include any taxes and cash prices for accessories and services, if any, included in a retail installment sale.
Ca. Civ. Code § 1802.8