Need help! Where to buy 15k armor?

hey guys i need some help. i have travel all over the world and i still dont know where to buy the 15k armor. can anyone give me the location to the place?

Grotto and Granite Citadel in the Southern Shiverpeaks. I believe Grotto is most easily accessible from Iron Mines heading South East.
Citadel is from Warcamp heading northwest.
Don't have a map in front of me (I am sure there are plenty on the net for you to search on) so I am not sure exactly about my directions or starting locations.

Half of the 15K armor types is available in the Granite Citadel, which is due north of Copperhamer Mines.

The other half of the 15K armor types is available in Marhan's Grotto, which is due south of Thunderhead Keep. You can also run there from the Iron Mines of Moladune, but it's much easier to complete that mission and go from Thunderhead, if at all possible.

thank you cherno!

thank you jet, that is also very helpful