Groupon offers a Sam's Club Savings 1-Year Membership bundled with a $5 Sam's Club Gift Card for $30. (This deal applies for new members only.) Assuming you'll use the gift card, that's tied with our mention from two weeks ago (although that came bundled with food), a savings of $25, and the best outright price we could find.
Of note, Groupon also offers it bundled with a rotisserie chicken and a $10 discount on set of installed wiper blades for $45. That's a savings of $125.