Revilod, I could not agree with you more about the operas of Saint-Saens, especially Proserpine, Ascanio, L'Ancetre & Les Barbares (as Samson et Dalila, Henri VIII, Helene, La Princesse Jaune are all currently available.) Good modern studio recordings of Etienne Marcel & Dejanire would also be nice. Btw, I have an extra recording of Etienne Marcel in a French radio broadcast of a Montpelier opera production if you want it. PM me, I only need a stamped envelope. It's a very interesting piece, hardly worthy of Tchaikovsky's scorn...)
A website called House of Opera (try googling it) offers private recordings of a Radio France (I'm assuming, these things are always a little vague) 1957 broadcast of the comic opera Phryne, as well as Serge Baudo's performance of the 1911 grand opera version of Dejanire (excerpts only) from Lyon in 1985. Phryne is in good sound, Dejanire only OK, but worth hearing...
It's amazing to me that we have so many Pacini and Mercadante operas in fine modern recordings (mind you, I'm grateful for them...) but so little Saint-Saens...
David