l like the bezendrine monks--good that someone was out there making fun of the wave of crap brought forth by enigma's unfortunate rise to popularity.
to find out about gregorian chant:
http://www.music.princeton.edu/chant_html/
to find recordings:
http://www.medieval.org/emfaq/beginlst/chant.htm
if you have access to a good library, you should be able to get some of the cds. it might be worth it to go to a nearby university library, get a daypass and check them out in the music library. then you can order what you like in particular, at the pace you can manage. or work out something else. the latter is how i manage it.