When will Jeanette MacDonald & Nelson Eddy films be released on DVD?

I was watching film clips from Jeanette Macdonald and Nelson Eddy films, which are some of my favorite musicals. They are so different from the other MGM musicals, and I love that. But it makes me sad that they aren’t on DVD yet. I often check what classic films are coming on to DVD, and I keep feeling that lots of crap movies, or just more of the same kind of classic films are being released onto DVD. Maybe it’s just because some of my favorite films have yet to be released (I demand a Greer Garson Film collection!), but I am so frustrated with the selections of classic films that are becoming DVDs.