Up first a multi-use card for Movieland Wax Museum, Japanese Village and the Palace of Living Art (?) offering a 10% discount.
Knott's Berry Farm had the "Prospector's Club" (later to become the "Adventures Club") that offered special "Pac-o-fun" ticket books.
Lion Country Safari offered a "special value" for its club members.
Convertibles not permitted.... Why would you even try that?