I bought it online via amazon from a semi local retailer ( one in my home state).
So far im pretty impressed with the 3 part mission. Not only does it look to be a really great mission, that i cant wait to set up for my players, but it also makes use of the "Space hulk generator" part of the book.
Chapters 1-3 are just the mission in 3 parts.
Chapter 4 is the Space Hulk Generator - this helps you make your own mission in a space hulk.
The suppliment has really given me some good ideas for missions so far. I also really like how the mission, gives each character a chance to shine.
Which is really important to me since my players are a Lib, Apothacary, Tech-marine, and a Dev. So im always looking for ways to make the apothacary, lib and tech marine feel special beyond just combat.
I paid about 38 including shipping for my copy, and I think it was well worth the money.