Thanks for the "gentle reminder" to pull out my Christmas music!! LOL
I have 2 books, but they aren't very challenging, but it was all I could find at the music store. They have neat arrangements, and I have played several in church. Keep in mind that these are not challenging, even though it is classified as late intermediate/early advanced
--- Jim Brickman--"The Gift"
---Jingle Jazz" '17 Christmas Standards with a Touch of Cool'--arranged by Philip Keveren
published by Hal Leonard Corporation
website is
www.halleonard.com (I haven't been to the website, but I thought I would give it to you anyway). It sounds like you would like this book this book better than the Brickman book, but both books have neat arrangements).
Hope this helps! I, too, have a VERY hard time finding Christmas music! grrrrrr