Hmm... that's less than I pay for eggs. Probably because they do have chickens there.
I can see the high cost being justified for other items, since all of these products that are manufactured on the mainland have to be flown in. Alaska is the same way.
I have friends who visit Hawaii every year and stay for a month at a time. They usually rent a house and stock their fridge with groceries from the farm markets. He says they can get local fish, beef, dairy, and vegetables at fairly reasonable prices by shopping this way (although still somewhat higher than what we're used to).