Harry Potter and the Goblet of Fire
These books, like the Bloomsbury proofs are not for sale to the public. Of the other two, we assume 3, were produced as well, but we don't know. I will say that the other two seem to be more common than the Stone ARC, but that can also be for a myriad of reasons. And you'll notice the cover art for the Azkaban ARC is checkerboard instead of the cover art like you see with the other two. This is because the publication date for Azkaban was pushed up to meet the demand and to keep US customers from ordering their books from the UK as they had with book 2.