Tracked by Evreward since 2008, Mighty Leaf Tea offers coupons, cash back rebates and rewards, with savings as high as 40% off. Mighty Leaf Tea discount coupons are seasonal, appearing every three to four months, and are often more valuable than similar merchants. Even when Mighty Leaf Tea doesn't have a coupon, you can always get up to 15% cash back, and other great rewards, with every purchase.