From musicexport, an Amazon MP seller based in Greece that in my experience, has excellent service and competitive prices. All these appear to be now OOP, and I thought I'd grab them before they become unavailable.

I finally discovered
Vierné's music last year (I had put it off for a long time because I really don't care for organ music, and that represents the bulk of his output). I was very favourably impressed by what I heard (the piano pieces, the
Piano Quintet and the
String Quartet, some songs), so I thought I'd go for his orchestral music--AFAIK, this is the only recording available--and the rest of his chamber works.

I was alerted to
Antoine Mariotte by
Mandryka's post in "The French Music Exploration Thread". His description (and the samples I listened to) sounded interesting. I do remember seeing years ago the Accord recording of his setting of
Oscar Wilde's
Salomé in the original French (work that created all sorts of copyright problems with
Richard Strauss and his publishers), but that seems to be completely unavailable now.

Now this is really obscure (it came up as a suggestion from Amazon when looking at the
Mariotte above--for once Amazon gets it right in that respect).
Jean Cartan (member of a distinguished family of mathematicians) died in 1932 at the age of 25. Again, the samples ad YouTube videos of his music sounded very interesting.