Costco is offering new members a 1-Year Gold Star Membership for $50. Apply coupon code "1080GOLDSTAR" to drop it to $49.99 and get a free $10 Costco Gift Card. (The gift card will be mailed to you within three weeks.) Deal ends July 31.
Of note, Costco also offers a 1-Year Executive Membership bundled with a $20 Costco Gift Card for $99.99 after coupon code "1080EXEC".
Note that although this listed as a promotion for a new California location, the membership is valid online and at all stores nationwide.