Amazon offers the ChefLand 16-oz. Plastic Tumbler 12-Pack for $13.99. Clip the 15% off coupon on the product page to cut it to $11.89. Plus, Prime members bag free shipping. (Non-members can spend $49 or more to qualify for free shipping; otherwise, shipping costs $7.30.) That's $11 off and the lowest total price we could find. Each cup is dishwasher-safe.