Home » Deals » Smoothie King: Free 12 oz X-Treme Watermelon Smoothie Today! Published: by Gretchen on May 31, 2023 | This post may contain affiliate links. Read my disclosure policy here. Try a smoothie completely free at Smoothie King! You can get a free 12 oz X-Treme Watermelon Smoothie at Smoothie King today, May 31st! Just look for this offer in your Healthy Rewards app! Valid in-store today only, May 31, 2023. Thanks, Passionate Penny Pincher! Reader Interactions Money Saving Mom® Comment