Costco is good for food if you want or need to stock up, as you have to buy in bulk. They have clothes, household goods, electronics at competitive prices. However, you may get a better real elsewhere on sale.
Have pharmacy, optical, tire service. You can also book vacations through Costco online and even buy a new car, boat, Rv, or motorcycle through Costco at a savings. Home improvement projects can be done through Costco contracted services at a savings. Costco can save you money of you know how to get the most out of your membership.