Cinco De Mayo is tomorrow! Why not celebrate with some healthy Jamba Juice? Sign up to become a Jamba Juice insider. You will receive a printable Jamba Juice coupon for $1.00 off any juice. As an insider you will receive special offers and insider news. Use this Jamba Juice coupon to celebrate the warm weather with one of the famous smoothies or juices from Jamba Juice! Coupon expires June 1, 2015.