back in stock! Get this Ozark Trail 30-Ounce Double-Wall Vacuum-Sealed Tumbler for $9.74 at Walmart.com. Shipping adds $4.97 or is free with in-store pickup. This is the lowest price we could find by $5. It is made of 18/8 stainless steel, and features a rust-proof and sweat-free design. Sales tax is charged in most states.