PrettyLitter Sale: Save 20%! Posted by Hello Subscription on December 14, 2017. 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 holiday sale! For a limited time get 20% on your first order with code LOVE20 Check out our PrettyLitter reviews to find out why our reviewer raves about it!