At time of writing,
Amazon UK has got the four disc 'Back To The Future Trilogy' for £7.76
It seems that the breakdown is thus:
DISC ONE: Back to the Future (1985)- Audio Commentary with writer/director Robert Zemeckis and writer/producer Bob Gale
- "The Making Of Back To The Future" featurette
- "Making The Trilogy: Chapter 1" featurette
- Outtakes
- Deleted Scenes:"Pinch Me"
"Doc's Personal Belongings"
"She's Cheating"
"Darth Vader" (Extended Version)
"Hit Me, George"
"You Got A Permit?"
"The Phone Booth" - 'Did You Know That?' Universal's Animated Anecdotes
- Original Make-Up Tests
- Storyboards To Final Feature Comparisons: "Skateboard Chase"
"Clock Tower Sequence" - Production Archive Galleries:"Marty McFly Photo Album"
"Behind-The-Scenes Photographs"
"The Delorean Designs"
"Time Travel Designs" - Theatrical Trailer
DISC TWO: Back to the Future Part II (1989)- "Back To The Future Part 2" featurette
- "Making The Trilogy: Chapter 2" featurette
- Outtakes
- Deleted Scenes:"Dad's Home" (Extended Version)
"Old Biff Vanishes From Car"
"Burned Out High School"
"Marty Meets Dave" - Hoverboard Test
- Storyboards To Final Feature Comparison: "Marty On The Hoverboard"
- Production Archives: "Marty McFly Photo Album"
"Behind-The-Scenes Photographs"
"Futuristic Designs"
"Vehicles Of The Future" - Theatrical Trailer
DISC THREE: Back to the Future Part III (1990)- "Making The Trilogy: Chapter 3" featurette
- Outtakes
- Deleted Scene: "The Tannen Gang Kills Marshal Strickland"
- Storyboards To Final Feature Comparisons: "The Indians"
"Showdown At Hill Valley"
"Final Train Scene" - Production Archives: "Marty McFly Photo Album"
"Behind-The-Scenes Photographs"
"Production Designs"
"The Trilogy: Poster Concepts" - Music Video: ZZ Top "Doubleback"
- Theatrical Trailer
- Bonus Trailer: "E.T. - The Extra-Terrestrial DVD"
DISC FOUR: Bonus Disc- Back to the Future:
- Q&A with director Robert Zemeckis and producer Bob Gale
- Enhanced Conversation with Micahel J. Fox
- Deleted Scenes (with commentary by writer/producer Bob Gale): "Peanut Brittle"
"Pinch Me"
"Doc's Personal Belongings"
"She's Cheating"
"Darth Vader" (Extended Version)
"Hit Me, George"
"You Got A Permit?"
"The Phone Booth" - Excerpts from the Original Screenplay
- Production Notes
- Back to the Future Part 2:
- Q&A with Director Robert Zemeckis and Producer Bob Gale
- "Production Design" featurette
- "Storyboarding" featurette
- "Designing The DeLorean" featurette
- "Designing Time Travel" featurette
- "Evolution Of The Visual Effects Shots" featurette
- Deleted Scenes (with commentary by writer/producer Bob Gale): "Old Terry And Old Biff"
"Dad's Home" (Extended Version)
"Pizza Scene"
"Jennifer Faints" (Extended Version)
"Old Biff Vanishes From Car"
"Burned Out High School" -- "Marty Meets Dave" - Music Video: Huey Lewis & The News "The Power Of Love"
- Production Notes
- Back to the Future Part III:
- "The Making of Back to the Future Part 3" featurette
- Q&A with director Robert Zemeckis and producer Bob Gale
- "Designing The Town Of Hill Valley" featurette
- "Designing The Campaign" featurette
- "The Secrets Of The Back To The Future Trilogy" featurette
- Deleted Scene (with commentary by writer/producer Bob Gale): "The Tannen Gang Kills Marshal"
- "FAQs About The Trilogy"
- Production Notes