Tracked by Evreward since 2005, Peet's Coffee and Tea offers coupons, cash back rebates and rewards, with savings as high as 20% off. Peet's Coffee and Tea discount coupons are seasonal, appearing every three to four months, but can be less valuable than similar merchants. Even when Peet's Coffee and Tea doesn't have a coupon, you can always get up to 10% cash back, and other great rewards, with every purchase.