On a whim I was at Walmart and saw the two pack in the back where the clearance stuff normally is. Did a price check and showed up as $10 so I bought them. Checked the website and found it listed as below.
Also the site shows (seemingly at random) that the 4pack of 10oz tumblers is $15 in store. Sometimes the $15 price shows up, some times it doesn't. While I was there they still rang up as $19. So might be an order online for in store pickup thing. Just posting it below in case someone is able to get it.