For their online store, they have a 20% off coupon when you enter the code "MERRY18" (good through 12/26/18). They also have another 20% off coupon for the new year that can be used from 12/31/18 - 1/2/19. The code for that one is "CHEERS18."
Additionally, through 12/24/18, Coolhaus scoop shops will be serving their Special Holiday Sammie at a $1 discount. The ice cream sandwiches features party time cookies with chocolate peppermint animal cookie ice cream.
Photo via Coolhaus Ice Cream.