PrettyLitter Coupon: Get 25% Off Your First Order! Last updated by Hello Subscription on May 28, 2018. Memorial Day Subscription Box Deals / Subscription Box Coupons & Deals / PrettyLitter Coupons Hello Subscription may earn compensation via links in this post. Read the full disclosure Save for Later Notification PrettyLitter has a pawsome deal! For a limited time, get 25% on your first order with code MEMORIAL18. Check out our PrettyLitter reviews to find out why our reviewer raves about it! Are you getting PrettyLitter?