TL;DR: Sign up for a 1-Year Costco Gold Star Membership for $65 and get a $20 Digital Costco Shop card to spend however you want. Where do you shop for groceries? How about clothes? Electronics?

Costco will be opening two new stores in California this week and four more in other states next week, which will drive the wholesaler's plan to have over 900 locations worldwide. A new location ...