You may already know this, but Stephanie Leal on the Big Island was planning to offer Macrobrachium rosenbergii the last time I was in contact with her a few months ago. Her email address is firstname.lastname@example.org. She currently carries Opae Ula and (supposedly a pure strain of white) Oriochromis niloticus tilapia. Since you are both on the Big Island, she might be your best source.
Another source is on Oahu that ships rosenbergii interisland, but the Hawaii Department of Agriculture need to inspect each shipment before it goes out, so this makes it a little difficult. Her name is Linda Gusman at LSGusman@yahoo.com.
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