Hi, I'm currently leveling my blacksmithing in Frostmourne and I've reached skill level 335 where everything trained from the trainer is yellow or green. I know that I should be able to buy the following plan/recipe:
https://www.wowhead.com/item=23594/p...acers#comments
and two more from a vendor in Shadowmoon Valley:
https://www.wowhead.com/npc=19342/krek-cragcrush

But he does not sell them. I think they are limited quantity but do you know if I can actually buy them from him or what the respawn rate is?