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Note: I've never seen the Runecloth Robe or Cloak patterns for sale on Darnall. That's just taken from what's listed here on Alla's. I'm beginning to believe it's incorrect.
I’ve not looked these items up, but they could be limited supply items. Many NPCs will stock “rare” items, but only one at a time. Once that one copy is bought no more will be available until the NPC restocks. And I have no idea how often that is. For example, there’s a gobbling in the ogre fort outside of Southshore who sells the alchemy recipe for Frost Oil. I was finally lucky enough to find a copy on him one day. Now I just need to level my alchemist so that he can make it.