For the purposes of Section 7319(e) of the Business and Professions Code concerning persons exempt from the Barbering and Cosmetology Act, the term “demonstrating” means to perform a one-time service on a consumer, without compensation, to show how that product is used or to prove its value or effectiveness, with the intent that the consumer may later purchase and apply the product him- or herself, without the help of a licensee or product instructor, and the purchase price of the product charged to the consumer is no more than its average retail price.