I purchase mine from Penzeys
It is often mixed with olive oil and spread on bread; sometimes this is done at the table, other times the mix is spread on the bread rounds which are then baked. Za'atar also serves as a seasoning to sprinkle on vegetables, salads or kebabs. Each country has a distinctive style of Za'atar, and each family develops its own special blend.
My neighbor served this with a fresh baked baguette, and 2 dipping bowls, one for the olive oil, the second for the Zatar. I, in turn, had company and served the same. Makes a great appetizer!