Atis?

Howzit group. I was wondering if anyone knows where I could pick up some 
  "Atis". I've been eating this super sweet fruit in Saipan and Tinian, 
but now that I'm home I've been craving the stuff. Anyplace on Oahu 
where you may have seen it? Been here all my life and I can't remember 
ever seeing it. Here's a link on the net so you can see what it looks
like:

http://www.tribo.org/vegetables/atis.html

The one I'm looking for looks exactly like the fisrt picture on top.

Thanks