I read often on the cruise board about Costco and that people book their cruises through there to get onboard credit. We would not be doing that in the next year. I am assuming it is like Sam's and only sells large sized items. Is that correct? I am planning a trip to Kauai and some people have said to stop by Costco because local groceries are too expensive. But if I am only there a week and there are only 2 of us I could not use such big sized product. Do you think it would be worth it for me to pay for a membership just to use it for 2 weeks? The nearest one to me is 45 minutes away so i doubt i would go there much.