Where can I buy Linen Cloth

I’m currently trying to level tailoring, and need a great deal of linen cloth to do so. I would prefer to buy the material as opposed to farming several hundred cloth, so I read on the wiki that there is only one vendor that sells it, and that they are in Silvermoon City.

Problem is the character I’m doing it on is an alliance character; so is there no way for me to buy it from an NPC?