7/16/18. Starbucks 2-Pack Tumblers To Go $14.99 Costco Item #1075109 Details: • 20 oz. Capacity (591 ml) • Acrylic • Straws included • Includes (2) Instant Refreshers – Very Berry Hibiscus OR Strawberry Lemonade Washington Costco. Price and participation may vary at your Costco and is subject to change at any time without notice. While supplies last.