Costco allows members to join on its website or in one of its locations. A picture ID is required for standard memberships. Business memberships require proof of business ownership or incorporation.
Costco offers several levels of membership depending on business or individual status. A gold membership is the traditional membership for household and personal use. This membership costs $55 as of 2015 and includes most Costco services including gas station use.
Other Costco memberships available are the standard business membership and the executive membership. Both services offer businesses the ability to use Costco stores and services. The executive membership offers an additional service discount as well as a 2 percent cash back option.