California Code, Vehicle Code - VEH § 23306

(a)(1) An issuing agency that operates an electronic toll collection system that permits payment by a transponder or other electronic toll payment device shall, directly or through a third-party vendor, make the transponder or other electronic toll payment device available for acquisition online, by mail, and in person at a retail outlet, the office of an issuing agency or processing agency, as defined in Section 40253, or customer service center.

(2) At least one retail outlet, kiosk, or customer service center that offers the transponder or other electronic toll payment device associated with the issuing agency shall be located within the jurisdiction of the issuing agency.

(3) The issuing agency shall post on an internet website related to its electronic toll collection system locations where tolls may be paid with cash, and locations at which a transponder or other electronic toll payment device may be acquired.