Obtainable by travelling by ship around 1250 times. The cheapest cheapest option is to travel between Edron and Cormaya which costs around 25,000 gp if you have completed mission 6 of the Postman Missions Quest. However, it takes around 2500 journeys by this route because only one way counts. On the other hand, the fastest option is to travel between Edron and Venore, but it costs around 37,500 gp .
You’ve probably never gotten seasick in your life — you love spending your free time on the ocean and covered quite a lot of miles with ships. Aren’t you glad you didn’t have to swim all that?