Right now this army is the only one where you can't buy the codex from GW. Your options if you want to legally have the codex is to hunt down and buy the 2 White Dwarf issues that contained it (issues #285 & 286 US).
There are some rumors of SoB getting something in the near future. My best guess is some form of digital codex through itunes at the very least. There is no way they will get any kind of complete update as in a full codex anytime soon, but it does sound like things are in the works.
Anyway thanks for reading, and I'll see you here on the blog.