If you take a look here, you’ll find a list of 29 free Christmas mp3’s on AmazonMP3. One in particular I’d suggest worth picking up is I Celebrate the Day by Relient K. I’m not really a Relient K fan (I can’t even name more than 3 songs of theirs that I remember) but I do quite like this original Christmas song by them. Stylistically, it’s also not the pop-punk they are known for so don’t let that scare you off either.