Still Confused About Heirlooms

After reading most (all?) of the questions about Heirlooms on this realm I am still confused. Every response I've read seemed to say, in so many words, that you can't get heirlooms here on Frostmourne. Yet today I saw two toons with the Headmaster's Charge staff, and another toon with the shoulders.

Am I missing something?

Thanks

Yes, you are missing the vendor in dalaran.

You buy heirlooms from the emblem of heroism vendor. Chest piece are not available yet though. There is also the vendor in wintergrasp.