Costco is an American-based warehouse retailer that sells items ranging from fresh produce and electrical appliances to wine and optical items. It is the largest retailer of wine in the world and the 9th largest retailer overall. Shop Costco.com for electronics, computers, furniture, outdoor living, appliances, jewellery and more. Costco Wholesale is a multi-billion dollar global retailer with warehouse club operations in eight countries. Costco was the world's largest retailer of choice and prime beef, organic foods, rotisserie chicken, and wine. It is a membership warehouse club, dedicated to bringing our members the best possible prices on quality brand-name merchandise.