I haven't found it here, either. But
Valet d'Coeur in Montreal has it on their website. Click "Catalogue de jeux," then "Cartes & Tarots," then "Tarots divinatoires." Then scroll down to "Tarots de Marseille." Currently it's the top entry in that section. Also, the opening page has a phone number you can call and speak to someone in English, if you want to go that way.
There is a romantic appeal, though, in ordering your Marseille deck from the publisher in Marseille itself. That's what I ended up doing. But I'm thinking about getting a backup copy at VdC when I visit Montreal next month.
-shaveling