You can save an additional $20 with an AMEX card that is registered for $20 off $20 at Sam’s Club. You can read how to register all of your primary and secondary cards for that offer here. That offer will also work for all gift cards sold on Samsclub.com.
You don’t need a membership to shop on SamsClub.com.
If you register your free online SamsClub.com guest account with an address in California you won’t even pay the 10% penalty for not being a member. That applies even if you ship your items and list your billing address outside of California!
Just add an item to your cart and use guest checkout:
If they do add a paid membership to your cart you can just uncheck the box on the bottom of your cart to remove the membership.