Hw do you get it?

vendor in iron forge

i i can go with my orc to iron forge this is a long way

helpful answer

next time make sure to visit "iron forge" with your orc for the extra 10% dps

Under city.

Most heirlooms can be obtained by buying them from the below vendors:

The Alliance vendor is located in Ironforce (Hall of Explorers) - Link to NPC: http://www.wowhead.com/npc=6294/krom-stoutarm
The Horde vendor is located in Undercity (Rogue's Quarter) - Link to NPC: http://www.wowhead.com/npc=6566/estelle-gendry

You might want to check this extensive guide though, as there are additional useful heirlooms (such as the rings) which you can obtain via other means: http://www.wowhead.com/heirloom-guide