This Ozark Trail 40-Ounce Vacuum Insulated Stainless Steel Tumbler falls from $19.97 to $14.97 at Walmart while supplies last. Shipping adds $6.99 or is free on orders over $35. This tumbler is sometimes compared to the Stanley tumblers that usually cost $25 more. This is the biggest price drop we've seen so far this year, and this price matches the lowest we've ever seen for this. The tumbler can keep drinks cold for up to 25 hours. There are six colors to pick from.