According to the Island Music Source Book, it's on Sonny's "Ka Aina O Hawai`i" LP (Lehua 2040), which as far as I know has not been re-released on CD--nor have I run across it in my attempts to fill the many holes in my collection. Interesting that it hasn't been recorded more often, especially since Sonny must have taught it to his students (Ozzie teaches it, right?).
[short pause to Google]
Just found a version of it on Mark Nelson's site, on a CD titled "Slack Key Guitar Solos and Duets":