Convenience Which one to join? The short answer can be found here: Costco Oahu Locations: Costco Hawaii Kai (East Oahu)Costco Iwilei (Downtown area)Costco Waipio (Waipahu/Leeward)Costco Kapolei (West Oahu) Sam’s Club Locations: Sam’s Club Keeaumoku (Ala Moana)Sam’s Club Pearl City (Leeward) Costco has four branches somewhat evenly spaced throughout the […]