Costco does not offer a trial membership as of 2015, according to Costco.com. Costco membership levels are limited to Gold Star Membership, Business Membership and Executive Membership.
One of the cheapest Costco memberships is the Gold Star Membership, which costs $55 annually. The Gold Star Membership is geared toward those who purchase products primarily for personal use.
The Business Membership also costs $55 annually but is geared toward business owners and managers. It allows the purchase of products for business use, as well as personal and resale use.
The Executive Membership costs $110 annually. It includes an annual 2% reward of up to $750, as well as greater discounts.