Have you ever tried growing it from seed?

My dad used to have this tree in his backyard, but they were producing too much fruits, the ripen fruits would just drop splat on the ground, and my dad quickly chopped the tree off. If you still couldn't find any, perhaps someone could give you a few seeds.

I think ulupalakua nursery carries trees, Kula Ace sometimes does, as well. Ulupalakua nursery advertises on Craig's List. I understand Plant It stopped propagating due to an insect that lays its eggs in the seed. Just as the fruit ripens it burrows out and ruins the crop.