where can i buy the black spear trolls tabard?

hi i need help, where can i buy the black spear trolls tabard? I find it beautiful and I would like to have it, I am exalted with the black spear trolls and I have already been able to buy raptors, I am an undead level 64, I already checked with the tabard seller in the parts where the brotherhood tabard is bought and nothing! I spoke to the npc troll named Samamba at icecrown, and she didn't let me see her merchandise.

I'd appreciate your help

You need to do Argent Tournament dailies to unlock it, requires level 80 I think. 1st you'll need to become champion of your own race, after doing that you can start your progress to become champion of the darkspear trolls to unlock the tabard.

Thank you very much, I finally know what I should do!