Free: Contests & Raffles.
Our last trip to alaska we had the fish processed and and frozen. They packed the Styrofoam coolers at 50lbs so you can just pay the extra bag fee and check it in with your luggage. We found it to be much cheaper then shipping FedEx or ups. It was still as hard as a rock 10hrs later when we arrived in Sea. It was $20 per 50lb box on alaska airline. If you go over 50lbs then you get a oversize fee added on. Good luck in HI.