I'm not sure you can get just a dust jacket. If you want to give it a shot, I would say writing to the publisher would be a good start.
Arthur A. Levine Books
Scholastic Press
555 Broadway
New York, New York 10012
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The short answer to this question is - One cannot find a replacement at all easily!
One's only chance is to find a damaged copy of the book or, in some cases, a remaindered or 'stray' copy in a Charity Shop or similar.
If the book is still in print one's task is easier but, generally, the whole venture is daunting and largely negative in outcome.
Floo powder
195 Pounds
Walter Bailes
Gold Dust is Dustin Rhodes the son of Dust Rhodes and the brother of Cody Rhodes
YES. Gold Dust is still alive and is still in WWE.