From the update:
And that my friends, is the Plague Faction Booster UNLOCKED.
You can now add on this awesome set of miniatures for just $20. Remember we’re running a 4 for 3 deal on these individual boosters where you can pick up any 4 Boosters for $60.
And if that’s not enough, our Plague Booster Bundle has now been unlocked – and they’re buy one get one free! Remember you can mix and match, meaning you can have two of the same or two different sets.