There are several shops around. Basel, Bern, Zürich.
I go to this one in Sursee for my special needs: https://quericoshop.ch/
Now, an opinion from a stranger on the internet. You also find in the shops dry chipotle chiles that you may use to make your own paste, salsa or whatever. The canned paste has a cheap vinegar flavor it’s really hard to get rid off.
Two other options are the British corner shop, which carries a paste from Mark and Spencer, and Amazon.de.
I had though to try the shop on josefstrasse, will update when/if I find a suitable version. Agree re: tinned version - concentrated flavour of the jarred paste is missing
Tom
Thanks for all the messages, on heading to Axa’s recommendation in Sursee https://quericoshop.ch/ , I was able to get my fix of Mexican products, would highly recommend