That number was from Immoscout24 listings of parking spaces for rent [0].
If you have vacant spaces in blue zones near you, that's a viable option. There are plenty of places where that's not the case though.
[0]: https://www.immoscout24.ch/de/parkplatz/mieten/ort-zuerich
Re:The integrated timetable of Switzerland
by throwaway2412 on Monday June 20, 2022 @10:54AM
(#31811072)
I pay 250 / month for a parking space in an underground garage. That's close to the upper limit from what I've seen. Usually, the prices start around 100-150 for a dedicated parking spot outside.
It's CHF 300 per year in a blue zone where you have to find a spot whenever you feel like parking your car.