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Where to buy 'Publico' newspaper
Have you tried Toute la Presse beside Merode metro? They carry a huge number of international titles.
You could try Filigranes on Ave des Arts
http://www.filigranes.be/fr/contact/
Just in case you can't find it to buy: you can read it for free at the Parliamentarium (I was there yesterday and checked and they do have it).