Originally Posted by
magiciansampras
Should we head right to Costco from the airport when we arrive in Kauai for the week to get our supplies or since we'll only be there for a week should we just go to the regular store? We did regular store last time and I remember it being expensive, but not ridiculous (compared to Whole Foods, but without the quality).
Or maybe I could just ask the previous guests in the condo to leave some of their leftover food for us.

Entirely subjective. Do you want to consume items that are sold at Costco and will you be able to use up the larger quantities you'll purchase there? If so, go for it. If not, go to safeway or equivalent.
But ideally, it'd be great if you could split a costco run with the previous guests in your condo.