There is a convent near Kansas City called the Benedictines of Mary that just released an Advent Music album. Apparently, the record label decided to take it international, and it has been something of a sensation. You can order it directly from their website or you can get it in MP3 format from Amazon.
I have been absolutely blown away but how utterly beautiful this album is. It is quite possibly the best collection of Advent music I have ever heard. I highly recommend it, especially if you are sick of elevator Christmas schmaltz already.
This is the video promo they put out: