There are several good MP3s of Christmas music priced at $5.99 or less on Amazon right now.
These are great to grab for in the car or if you will be entertaining this season.
The Michael Buble Christmas MP3 is one of my favorites and it is priced at $5.99.
They also have Kidz Bop, Rod Stewart, Josh Groban and more priced at $3.99- $5.99. My children love the Kidz Bop Christmas CD- they can sing along to that one. One other Christmas CD that we play year after year is the Harry Connick, Harry for the Holidays. I actually have it on CD and I had to replace it last year because it was so worn out ;). That one is $5.99.
If you just want individual songs, those are starting at $.69 each.