The Miami Drive-in Theatre located in of course, Miami, FL - opened on February 25, 1938. It was Florida's first drive-in theater. This flyer is for the movies showing the week of July 10, 1938. Only 25¢ per person with children under 12 FREE! As you can see, owners of even the early drive-in theaters saw the value of letting younger children in free as a way to get the parents out to their theaters more often. "No Babysitter Costs," was an early drive-in gimmick that would really catch on in the 1950's.