More thread creep...

Q, if you go to Amazon, select the Music store and enter "Edmund Pascha", they have at least four recordings obtainable in CD form (in the US--I can't speak for Canada, but I doubt they could not be shipped there). Though most are from resellers, one of them (by Musica Bohemica) is handled directly by Amazon rather than resellers or partners.
http://www.amazon.com/Edmund-Pascha-Christmas-Mass-Carols/dp/B003WJRPAE

I was going to mention the Ryba mass as well, but though quite tuneful, it doesn't grab me as much, and figured anyone listening to the other clips would notice it in the suggested clips list. If you want to explore further afield for Czech Christmas music, I suggest searching for the playlists "Ancient Czech Christmas Music" (43 clips, which include the Pascha/Zrunek and Ryba masses and carols) and "Czech and Moravian Carols" (23 clips, with multiple songs in each clip).