To the best of my knowledge, here’s what you get.
There are three versions of each movie. The original theatrical versions ran 178, 179, and 201 minutes. The extended versions ran 208, 223, and 251 minutes. Then there are the extended credits editions - these are the same cut of the movie as the extended edition but they have much longer end credits because they list the names of all the fan-club members who paid to have their names included in the credits. These movies run 228, 235, and 263 minutes.
On DVD:
- The theatrical versions - No longer in print but available for $54.40
- The Platinum Edition: the extended versions with six bonus discs of extra features (two discs per movie) - List Price: $80.95
- Original Theatrical and Extended Limited Edition: the theatrical versions and the extended versions but no bonus discs - List Price: $86.98
On Blu-Ray:
3. The theatrical versions - which includes the dvd and digital versions of the movie - No longer in print but available for $39.99
4. The Extended Edition: The extended credits versions with bonus discs of extra features - but the bonus discs are dvd not blu-ray and are identical to the dvd extended version bonus discs. - List Price: $119.98
Here’s what’s on the bonus discs
The Appendices, Part 1: From Book to Vision (The Fellowship of the Ring)
Peter Jackson introduction
J.R.R. Tolkein: Creator of Middle Earth
From Book to Script
Visualizing the Story
Designing and Building Middle Earth
Middle Earth atlas interactive
The Appendices, Part 2: From Vision to Reality (The Fellowship of the Ring)
Elijah Wood introduction
Filming The Fellowship of the Ring
Visual effects
Post-production: Putting it all together
Digital Grading
Sound and music
The Road Goes Ever On…
The Appendices, Part 3: The Journey Continues (The Two Towers)
Peter Jackson introduction
J.R.R. Tolkein: Origin of Middle Earth
From Book to Script: Finding a Story
Designing and Building Middle-Earth
Gollum
Middle-Earth Atlas interactive
New Zealand as Middle Earth (map with video location)
The Appendices, Part 4: The Battle for Middle Earth (The Two Towers)
Elijah Wood introduction
Filming The Two Towers
Visual effects
Editorial: Refining the Story
Music and Sound
The Battle for Helm’s Deep is Over
The Appendices, Part 5: The War of the Ring (The Return of the King)
Peter Jackson Intro
J.R.R. Tolkien: The Legacy of Middle-earth
From Book to Script
Designing and Building Middle-earth
Home of the Horse Lords
Middle-earth Atlas: Tracing the Journeys of the Fellowship: interactive map
New Zealand as Middle-earth: interactive map with on-location footage
The Appendices, Part 6: The Passing of an Age (The Return of the King)
Elijah Wood/Sean Astin/Billy Boyd/Dominic Monaghan intro
Filming The Return of the King
Visual Effects
Post Production: Journey’s End
The Passing of an Age
Cameron Duncan
All this assumes you’re buying the three movies as a set and not as individual movies. If you go with individual movies, there are other options. For example, you can buy the extended editions on blu-ray individually if you don’t care about the fan credits. In some cases, it can be cheaper to buy the three movies individually than to buy them together as a set.
Finally, I showed list prices. You can easily find them discounted at Amazon, WalMart, Best Buy, or other places.