Sources:
This item can be Vendor Purchased:
Abysmal Sea
Godain MacKodor @ -5, -146, 98
East Freeport
Quanan Mahius @ -784, -509, 6
West Freeport
Locarme Zennix @ 1534, -1658, -129, in Temple of Marr
http://www.eqtraders.com/items/show_item.php?item=6405