Arm & Hammer offers its Arm & Hammer Clump & Seal Cat 14-Lb. Litter for free (up to a $10.99 value) via their Try Me Free! Mail-In Rebate. (Product must be purchased in store. Walmart charges $7.97 with Site-to-Store pickup.) That's the first freebie we've seen for this cat litter. Rebate expires November 30.