Hmmm. Quite a few.
John Roberts
Anne Lister
Jean Ritchie
Debra Cowan
Jed Marum
David Coffin
Kathy Kallick (daughter of Bruce)
Tom Bliss
Jim Moray

In addition, there are lots of cuts from Mudcatters on Singing Through the Hard Times: A Tribute to Utah Phillips

You'll find lots of folk labels at emusic, most notably Smithsonian/Folkways, Topic, and Fellside.

I have a two-year membership which give me 75 cuts a month, for about $20 a month.

-Joe-