I think the link/clone wards idea is good as well as making the search function a little more global. Linked markets with the establishment of alliances seems story fit as well as a "linked" economy. Plus the Ul'dahan in me sees prosperous trade as the heart of the alliance yes?

After all, anytime I leave my glorious hometown to head to that stick and tree hovel up north its so inconvenient to have to trot back home to a proper country to grab some spare materials.