Blizzard have been trying to fix the issue of some disappearing PvP vendors in MoP Classic. While still unable to fully find the bugs causing this disappearance, they have made copies of the vendors available to players!
You can temporarily find the new NPCs on the 2nd floors of the Shrine of Seven Stars for the Alliance and the Shrine of Two Moons for the Horde. They will be removed once the originals return.
Over the last few days, we’ve been working to address the issue of disappearing PvP vendors, with mixed results.
Today, to temporarily address the issue, we’ve created copies of each of the vendors, and we have placed them on the 2nd floors of the Shrine of Seven Stars for the Alliance and the Shrine of Two Moons for the Horde.
The in-game map should show their new locations.
Thank you very much for your patience and understanding!