Half-Life Fallout: Valve Comics collection available as book and app - Half-Life Fallout

Valve makes a quite a few comics do go along with their games and updates like Left 4 Dead, Team Fortress, and Portal. Now you can view them in a collection together in the book 'Valve Presents: The Sacrifice and other Steam-Powered Stories'. It has be available as a book for a little while now on the Valve store but now you can also have it on you iOS or Android device with the Dark Horse Digital app. But if you are a little short on money you can still read them for free on their websites. Here, here and here!.

I know The Sacrifice has been on Comixology for a while now. It is free but does not contain the other stories...