£25 for individual membership.
If you are talking in plural terms, you can say Costcos. Ex: there are 3 Costcos within a 10 mile radius of my house. If you are talking in ownership terms, you can say Costco's. Ex: Costco's...
Chinese Over-Seas Trading COmpany = COSTCO. I had a patient one time who was a higher-up for the company.
Costco is a warhouse based store the specializes in the selling of case goods and bulk items.
Yes you get worldwide entry with your membership and it also works just as well the other way round as I used my UK card in Orlando in early December