The Seattle-based coffee company is now selling the plastic cups for $1 at St. Louis coffee shops.
Prior to the reusable tumbler, Starbucks already offered a 10-cent discount to customers who brought in a reusable mug. The company's goal is reportedly to serve 5 percent of all drinks in reusable cups by 2015.
Would you pay $1 for the reusable tumbler? Tell us in comments.