Sun's Tea via Amazon offers the Sun's Tea 20-oz. Strong Double Wall V3 Glass Tumbler 2-Pack for $19.98. Better yet, add two to cart and apply coupon code "GCE7CBX9" for a final price of $31.98. With free shipping, that's a savings of $28 and the lowest total price we could find. These 7" glasses are dishwasher- and microwave-safe.