The net effect is the same though.
Well, not entirely. The main effect is that you won't find new issues of Mein Kampf in the bookstore, which of course would also be the case had it been banned.
I don't how it is with antique shops. I guess if the owner has the balls to admit that he has an old issue of Main Kampf and is willing to sell it, it is not so much a problem. But I guess placing an issue of Mein Kampf in your shop window isn't necessarily good for business.
Out of sheer curiosity, I looked for English versions of Mein Kampf on the German Amazon.de website. "Hitler's Second Book: The Unpublished Sequel to Mein Kampf" is available. Second hand issues of the original Mein Kampf are also available in English on "Amazon Marketplace".
I'm actually curious what will happen in nine years from now. Will some tiny far right publishers start to print Mein Kampf again?
You bet. (Although as that book is hardly an advertisement for Nazi "thought"...)