Re: help needed: sumac and za'atar in Zurich
You can find Zaatar and Ras al Hanout in COOP in the spice section, they have specialist spices now with the gourmet packaging. Sumac you should find in a Turkish shop, try Barkat in Wiedikon, if not there is a spice stall at the Christkindle Markt in HB, or Globus or Jelmoli it will be a little bit more expensive however.
I wish they would just stock these and All Spice as normal spices, and golden syrup and Muscavado sugar. Cooking trends in Switzerland happen later then the rest of the world and if you need specialist ingredients you really need to search.