FREE Mucinex at Dollar Tree! Dollar Tree Sale Dates: NOW through 01/19! Stock up on Mucinex at Dollar Tree by using a $2.00/1 insert coupon. This will need to be adjusted down by the cashier and you will not get any money back. YAY for FREE!!!! Here's How To Do This Deal: Buy: One (1) Mucinex Fast Max Liquid 6 oz. $1.00 Use: $2/1 Mucinex Product, exp. 1/19/20 (SS 12/08/19) View Post