Is there a Costco in Guam?

Yes, there is a Costco in Guam, located in Tamuning near the tourist core, and it carries real weight in the cost-of-living picture. The island’s import economy pushes most grocery and household goods 20 to 40 percent above mainland US prices, so Costco’s bulk pricing meaningfully offsets that premium for households willing to buy in larger quantities. The store stocks mainland-comparable inventory with some local additions, and the gas station typically prices fuel a few cents below surrounding stations. For families, a Costco membership often pays for itself within a couple of months. Military households can use the on-base commissary for similar savings. For the full cost picture, see our Guam cost of living page.