I purchased the rather well-endowed U.K. release of Prisoner last year. It was well worth it! Btw, it's one of the many films being released individually on the same day.

Also, there are three mini-collections:

The Essential John Ford 

Grapes of Wrath 
How Green Was my Valley?
My Darling Clementine 
Drums Along the Mohawk 
Becoming John Ford 
Frontier Marshal

The Silent Epics 

The Iron Horse (two versions)
Four Sons 
Hangman's House 
Just Pals 
3 Bad Men

The American Comedies 

Steamboat Round the Bend 
Doctor Bull 
Judge Priest 
Up the River 
What Price Glory 
When Willie Comes Marching Home