Nevertheless...
...I would check in a few of the better and less stuffy travel guidebooks, such as "Lonely Planet" or "Rough Guide". I know there was a very nice card shop in Florence, within a short walk of the Santa Croce church, but that was a few years ago. They had all sorts of regional tarrochi decks, as well as many others, including artistic poker. I'm sorry I can't recall the name. Travel and age can both blur one's memory! Best wishes.