My early days, which might be earlier than yours: worked at Taco Bell in Isla Vista, Cal; menu items were 19¢. So 4 tacos and a Pepsi (no Coke) for a buck.
I remember when McDonalds first introduced their Quarter Pounder. I don't recall the year, but it was around Christmas - I remember seeing the first commercial on TV while watching "A Christmas Carol." I also remember that it sold for $.59, $.69 for a QP with cheese!
Mark