Robert de Niro & Martin Scorsese

Where can I find Raging Bull and Taxi Driver? I am a fan of both Robert de Niro and Martin Scorsese, but I still haven't seen the classics they collaborated.  

Martin Scorsese:

The Departed (2006)  

The Aviator (2004) - again with Leonardo DiCaprio

Gangs of New York (2002) - again with Daniel Day Lewis (I don't like his picking of Cameron Diaz)

Casino (1995)

The Age of Innocence (1993)

Cape Fear (1991)

Robert De Niro:

Stardust (2007)

The Good Shepherd (2006)

Analyze that (2002)

Showtime (2002)

Analyze this (1999)

Sleepers (1996)

Casino (1995)

Cape Fear (1991)

Awakenings (1990)

Frankenstein (1994)

Godfather II (1974)