Ozark Trail 12 oz stainless tumbler $6.74 at Walmart.com free store pickup
I found a "secret" item on Walmart.com. It's a 12 oz vacuum insulated stainless steel Ozark Trail tumbler. It's hidden in the listing for the insulated can holders. I ordered one for free site to store pickup and I can confirm that it is indeed a 12 oz tumbler as shown in pics 3-5. It does not seem to be sold in stores. The lid is the same size as the 20 oz. I'm kind of obsessed with Tumblers so it was really cool to add a 12 oz one to my collection.