I went through the SF section a few weeks ago looking for books to display. There were numerous mystery novels so I was hoping for a decent endcap of sci-fi stuff. In retrospect, given how these books take place in other worlds it shouldn't have surprisesd me how few there'd be. I guess it's surprising there are so many. I'm sure there are books I didn't find, so if you know of ones that didn't make my list please comment them. Here are the books in no particular order.
Carol For Another Christmas - Elizabeth Ann Scarborough
Hogfather - Terry Pratchett
A Yuletide Universe - Brian Thomsen, ed.
Miracle & Other Christmas Stories - Connie Willis
Wolfsbane & Mistletoe - Charlaine Harris & Toni Kelner, ed.
A War of Gifts - Orson Scott Card
The Claus Effect - David Nickle & Karl Schroeder
The Stupidest Angel - Christopher Moore (not shelved in sci-fi, but applicable)
The Frost-Haired Vixen - John Zakour
Dr Who: Short Trips: The Ghosts of Christmas - Cavan Scott & Mark Wright, ed.