As of ALPHA V.0.146 only buying an Island Update is avaliable.
*QUACK!* I'm Tobi of the Mallard Guard. Sworn protector of the Sky Islands, appointed by Zeus. This is your family island, passed down each generation, You can store your items here on the is;and and build ip your estate. Any orders such as expansions, crops and livestock can be done though me. If you're looking to go to the island capital (online), go to the dock and take the air ship...