You can also buy them online
https://www.stadt-zuerich.ch/pd/de/i...line-shop.html
and print at home, provided that you know the licence plate number and have a printer
I recently learnt there is a website where you can see all parking lots in the area, including some free ones (!)
http://ch.parkopedia.com/
If you use Google Chrome for browsing, it can automatically translate the site content into English.
Hope this helps!
KR,
Goran