In the early 50s, a Saturday cartoon marathon for the kids was $.09 admission. I would go with my buddies and after the show we would buy model airplane kits for $.10 -$.15. Entertainment for the whole day for less than a quarter. But, as you say, feature movies were $.25 admission. Most theaters changed the movies shown twice a week.
Indeed, the Star theater in Amarillo had nine-cent admission on Saturdays. What I remember is how sticky the floor was. You could lose a shoe...