Listerine Mouthwash Coupon – Save $2/1 *HIGH VALUE COUPON* This post may contain affiliate links. Please see the full disclosure policy here. Posted on December 14, 2012 Written by Mary Leave a Comment There is a NEW high-value coupon available for $2/1 Adult Listerine Mouthwash 1 liter or larger. Print this one now, it will be gone fast – will make for some awesome deals at the drug stores!!!