Mantic Games is now offering an Undead Ghoul Horde.
From their announcement:
We have seen that quite a few people are ordering one of each of the Ghoul Regiments and Ghoul Regiments with Ghasts, so it seems that a Ghoul Horde is quite popular.
What we have decided to do is make it even easier for you to pick up your own Ghoul Horde, so now you get everything you need in one product, and you make a nice saving over buying the boxes individually as well, how great is that.
So what are you waiting for? Order your Ghoul Horde now.