I was going to suggest you go to a dog show and meet the breeders, but I just went and looked at the online records of the shows in HI and unfortunately more often than not no Boston Terriers are even entering in the shows!

There are quite a few wonderful breeders in California, I know traveling is expensive but so are vet bills can run thousands of dollars if you get a boston with health issues. Healthy well bred bostons in the 48 very often cost $2000, I expect on the island they are more rare and challenging to find, so I would not be surprised if similar puppies cost even more. I think most things cost more anyway on the island, so I expect bostons are the same. If you can save a $1000 by purchasing from the west coast, then that might pay for your airfare.