Oh, and then there's this version of the BD DVD set of season 5:
Lost: The Complete Fifth Season Dharma Initiation Kit on Amazon
The Special Edition Dharma Season 5 Box Set
This is the first Lost box set to have a special edition version. It is called the Dharma Intiative Orientation Kit. It comes in a unique package and contains a 5 discs, 1 VHS tape, some maps, stickers, pamphlets, and other paperwork.
From LOSTPEDIA here are all of the bonus features:
Contents of Lost: The Complete Fifth Season Dharma Initiation Kit
Bonus Features:
LOST on Location
The Lie
The Little Prince
The Life and Death of Jeremy Bentham
Namaste
He's Our You
Whatever Happened, Happened
The Incident
An Epic Day With Richard Alpert
Building 23 & Beyond With Michael Emerson
LOST 100 - Blu-ray Exclusive
Making up for LOST Time
Bloopers
Deleted Scenes
No Police
Jill the Butcher
Finding LaFleur
I think he's one of Ben's People
Breakfast Time
Locke's Promise
Phil's Theory
Stones & Boulders
Mysteries of the Universe
LOST University (Blu-Ray Disc Only)