Neither The Man In The Gray Flannel Suit and Soldier of Fortune are on Bluray in the US.
As far as I know, of these two, only Soldier got a Bluray release and only in Germany.
Bella Darvi was indeed Zanuck's mistress, but I do not think the same applies to Darnell (even though I heard the same rumour, when her been cast in Bernadette is mentioned). Actually she was constantly rebelling against Zanuck and was constantly punished by it (being replaced in the brunette...