Walmart offers the Ozark Trail 20-oz. Stainless Steel Tumbler in several colors (Robin Egg Blue pictured) for $6.74. Opt for in-store pickup to dodge the $5.99 shipping fee. That's the lowest price we could find for any color today by $2, although we saw it for $2 less in January. This BPA-free tumbler features double-walled vacuum insulation.