Dollar Tree: Free Mucinex Shared on October 18, 2016 This post may contain affiliate links which means I make a small commission if you make a purchase at no additional cost to you. See the disclosure policy for more information. Get free Mucinex at Dollar Tree. Mucinex on sale $1 Use $2/1 coupon from 10/2 SS insert FREE after coupon Find more Dollar Tree deals here. Get the exhaustive list of Dollar Tree coupon match-ups with a printable list feature here. Save PinEmail0 SharesThis post may contain affiliate links. See the disclosure policy for more information.