I am looking for a cd for the Nativity that is in Church Slavonic. I have been looking online but no luck so far.
A wonderful CD is the "Russian Christmas" by the Russian Patriarchate Choir, which specializes in Znamenny chants. Unfortunately, like almost all of their CD's, it's out of print. You can download almost the entirety of their recordings as a torrent here
. Normally I don't advocate downloading music like this, but, like I said, almost all their stuff is out of print (except this CD: http://www.amazon.com/gp/product/B0000DEQDQ/ref=pd_lpo_k2_dp_sr_2?pf_rd_p=486539851&pf_rd_s=lpo-top-stripe-1&pf_rd_t=201&pf_rd_i=B00005QF3J&pf_rd_m=ATVPDKIKX0DER&pf_rd_r=19ZGGSMYF2H8J0K37KMN
If you want an idea of what the Christmas album sounds like, here is the kontakion: http://www.youtube.com/watch?v=qMQldP-yOj0