Tide Cats is offering up a new mail-in rebate, valid for a FREE Tidy Cats Pure Nature Cat Litter! This offer is valid on 7.5 lb. bag, 12lb. bag, and 14 lb. bag of Purina Tidy Cats brand Pure Nature. Just complete the rebate form by May 12th. Be sure to read the rebate form carefully and to follow the instructions as stated.