I know you asked for non method books, but the favorites my students like are the Faber pretime to bigtime books, Piano adventure Christmas books, Hal leonard Christmas books, Alfred's Top Hits Christmas books. Those make up the staples in my studio. Hal leonard is probably used them most because of the CD accompaniment discs.
Non method books are for my more intermediate students and adults. They like Bober's Christmas arrangements and Kevin Costley's, Nutcracker arrangements from Alfred, Jeanine Yeager has some nice Christmas books and Catherine Rollin. I'd like to try some from Philip Keveren this year.
I also go a little bit below level so they can play several. I start holiday music the Monday after Thanksgiving. I absolutely love teaching Christmas music!