The films aren't trade, if they're available for purchase. You can check Amazon for availability. They're just listed here for my own records :o)

Video
1930- Murder*
1930- Juno and the Paycock*
1931- Rich And Strange*
1932- Number 17*
1934- The Man Who Knew Too Much (1)*
1935- The 39 Steps   
1936- Sabotage*
1936- Secret Agent*
1937- Young And Innocent*
1938- The Lady Vanishes* and also ^
1941- Suspicion
1941- Mr. and Mrs. Smith^
1942- Shadow of a Doubt
1942- Saboteur
1944- Bon Voyage
1944- Aventure Malgache
1944- Lifeboat^
1945- Spellbound^
1948- Rope
1951- Strangers On A Train
1953- I Confess^
1954- Dial M For Murder
1954- Rear Window^
1955- The Trouble With Harry
1955- The Man Who Knew Too Much (2)
1956- The Wrong Man^
1958- Vertigo (1997 remastered release)
1959- North By Northwest
1960- Psycho
1963- The Birds
1964- Marnie
1966- Torn Curtain
1969- Topaz
1972- Frenzy
1976- Family Plot

Other Video
About 16 or so uncataloged hours of Alfred Hitchcock Presents and The Alfred Hitchcock Hour^
Family Portraits: Alfred Hitchcock^
The Movie Makers: Alfred Hitchcock^
Dial H for Hitchcock^

* indicates EP release
^ indicates taped off television