You can get this and several others here; http://www.jazzbooks.com/mm5/mercha...AJAZZ&Product_Code=V78DS&Category_Code=AEBPLA
However, these Christmas tunes are typically very easy to learn or transpose so you could probably take any version of it (piano, guitar, etc.) and write it out in the key you want in 20 minutes.
However, these Christmas tunes are typically very easy to learn or transpose so you could probably take any version of it (piano, guitar, etc.) and write it out in the key you want in 20 minutes.