The translated books I read, I try to get the European Portuguese eBook. I was successful in finding this for the Harry Potter books. They are actually translated in both dialects I believe. When I asked my Brazilian friends and family about some of the words in my translation of Harry Potter, they didn’t have a clue … words like malga and peugas. (And I even seen some hot mulled wine offered in a malga in Palmela!)
Usually I’ll look at the publisher or the translater to see where they are from before buying the books.