User blog comment:Hyperborean/"The House of Hades" – official expectations blog/@comment-7742465-20131002000915

So it says on Rick's blog that depending on where you buy the book, you'll get some cool things with it. For example, if you buy it at Sam's club or Walmart you get CHB/CJ bumper stickers. If you buy it at Target, you get some cool HoH bookmarks. And if you buy it at Barnes and Noble you get a map of Tartarus.