Here are two discounts on new Costco memberships. If you are an existing member, there is a deal for you too! See below.
Buy a new $50 Costco membership online with your AmEx card and get an extra two months free (which is equivalent to about $8). Sign up by June 30 to get the extra two months. Use coupon code SelectGS. Unclear if the code is case sensitive.
Or you can get a $10 Costco cash card if you buy a new $100 Executive Membership. You must also be a new member and sign up online with your AmEx card. Limit one Costco Cash Card offer per household. Use coupon code SelectEX.
If you are an existing Costco member, you can get two months tacked onto your membership for free when you sign up for auto-renewal with any AmEx card. This is only good on your first year signing up for auto renewal. You can cancel the auto renewal at any time.
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Free two-month Costco membership for buying a year