I know the plant is becoming harder and harder to find in the nursery due to it's invasive and destructive habitat. It has been known to escape cultivation easily and wreak havoc on native populations.
Sorry about all the doom and gloom...it's does look beautiful when fully grown however...
(if you are still serious about getting one I think Mori Gardens may have some in the garden centre in NOTL)
Good luck and happy gardening,