There's this one from Topic Her Mantle So Green though I haven't heard it. MB also appears on some of their Voice of the People discs, you would need to check the track listings to discover which.

She appears in this Saydisc recording of traveller music.

If you want to download then burn your own CD (they do allow it and the downloads are good quality) then Smithsonian Folkways are worth the visit. They even have the sleeve notes downloadable as a PDF. She's on most of this one also.