The layout of the calendar repeats over time. You don't have to buy a new calendar every year. For example, for 2023, you can reuse the calendar for 2017. Big Calendar does not want you to know this! Wake up, sheeple!
(Yes, I know that most of us receive so many calendars in the mail that we never actually buy new ones. Don't stop me. I'm on a roll.)
@DavidDvorkin I remember my parents have been doing this ever since I was a child. Nice calendars were hard to get in Poland in the communist period :)