I think the Sony Walkman came out when I was in high school; can't remember the cost. But I do remember the first calculators being sold at Radio Shack, I think they were closer to $100!...
Bebu is right. The calculators were a hundred dollars. My father still has my old Radio Shack calculator that I bought to use when I tested for my 2nd and 1st class radio/telephone licenses at the FCC in Atlanta. Heh, what a waste of money--both licenses have been discontinued and now all you get is a "general class".