For the future (too late for this year, as noted above) get a copy of the Christmas edition of the Church Piper set of books. I think his settings are a little overly ornamented, but the important notes are all there and it is easy to change doublings to grace notes and so on.
It is also not that hard to take a book of Christmas Carols and just rewrite the notes in A, rather than F or C (the two keys I hate playing on the banjo, but half the music seems to be written in them because it is easy for piano beginners). It takes time to rewrite it if you can't transpose mentally (I'm not good at it), but can be worth it if you want the music written out for you.
And as mentioned previously, a lot of it isn't too hard to just figure out by ear. Pipers sometimes spend too little time learning by ear anyway. Think of it as developing a vital skill of musicianship. And saves you the cost of a book.
-Patrick
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