Saw this on Groupon. Most likely for new members.
Purchase a Costco Membership Activation Certificate to join as a new member and receive a Costco Shop Card.
Costco Shop Card
Your Costco Shop Card can be used at any of our warehouses, gas stations, and online at Costco.com.
Gold Star Members receive a $10 Costco Shop Card
Gold Star Executive Members receive a $20 Costco Shop Card