We have 3 Litter-Robot coupons for you to choose from including 2 sales, and 1 free shipping coupon. Latest offer: 'Follow Litter-Robot on Twitter & Facebook and Receive the Latest News & Updates!' In the last day, 1 promos have been used. The last time an offer was used was March 16, 2014.How to Use Litter-Robot Coupons Get coupons for the Litter-Robot, and then use promo codes for free shipping. If you are not satisfied, you have 90 days to send the product back and get your money back. There is a section with accessories that are on sale at various times during the year including holidays.