These days no self-respecting person would buy a car without a CD player as well as a radio but back in 1967, when the heater and demister were often an optional extra, finding a car with a radio fitted was next to impossible.
However, if you had the money and the inclination the hardware to install a radio was already in the shops and ready to buy and fit.
But, before we start talking prices let me set the scene. In 1967 if a man had a good job he was earning around £20 a week (women and young people a lot less). A normal inexpensive 35mm film camera cost between £40 and £60 and a good pair of binoculars about £35. An eight day all-in holiday in Majorca could be had with BEA (British European Airways) for around £30 (and a lot of fun they were, too!).
Part 1