These links may be useful:
Benedictine Monastery of Sao Paolo, Brazil
Gregorian chants of the Church year, with audio files
www [dot] christusrex [dot] org [forward-slash] www2 [forward-slash] cantgreg
Holy Innocents Church, NYC
Gregorian chants of the Ash Wednesday Mass and Lent, 2009
tinyurl [dot] com [forward-slash] bmjav5
Most of these are mp3s (a few .wav files here and there, I think). The first link has sheet music in GIF format if you're so inclined to read along.
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