PetSmart has:
42lb Scoop Away Complete Performance Cat Litter – Clumping , Low Dust on sale at (2) for $23.98 (price shown in cart) when you add a Quantity of 2. Free store pickup.
42lb Fresh Step Simply Unscented Cat Litter on sale at (2) for $27 (price shown in cart) when you add a Quantity of 2. Free store pickup.
Additionally, other litter is available as well as part of their Buy 1 Get 1 50% off.