can anyone recommend a shop to buy a clay pot for oven or gas cooking?
That's a bit on the vague side...
Have you tried a large supermarket?
Try a Romertopf. We use one all the time for roasts or chicken. Very useful in a kitchen.https://www.google.be/search?q=romertopf&oq=romertopf&aqs=chrome..69i57j...
Try Petits-Riens on Rue Americaine. Top floor. They have all sorts of stuff like this.
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