Any supplier who sells any discount card in Kansas shall provide each prospective customer before purchase or at the time of the confirmation required by K.S.A. 50-672, and amendments thereto, a written list for each type of service offered in conjunction with the discount card containing the name, address, and phone number of the closest 25 health care providers in the prospective customer’s service area that are contractually bound to honor the discount card. The written list of providers may be provided electronically if requested in that format by the prospective customer.