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In page Harry Potter and the Prisoner of Azkaban:

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Harry Potter and the Prisoner of Azkaban was issued, prior to publication, in two distinct UK proof editions, and one US "Advance Reader's Edition".[1] The first UK proof, in purple wrappers, differs from the second in a number of respects, and is thought to have been printed in a small edition of 50 copies.[1] The second UK proof is in green wrappers and was printed in a somewhat larger run.[2][3] The US Advance Reader's Edition is the last of its kind in the Harry Potter series,[citation needed] as no Advance Reader's Editions are known for books 4 through 7.[citation needed] The rear wrapper of the Advance Reader's Edition reveals the circumstances of the US publication of the book: