What did it cost to run the tiny ads in the back of magazines back in 1964? Remember that for many of these companies this was the only access they had to a particular group, in this case teenage girls. Since most of the tiny ads were for photo processing these companies had to somehow get their message out when surrounded with ads yelling "25 PHOTOS FOR $1!"
Below are a few examples from the March and September 1964 'TEEN magazine. Note the John F. Kennedy charm available just a few months after his assassination. I wonder how many they sold.
(SOURCE: 'TEEN, March 1964)
(SOURCE: 'TEEN, September 1964)