Amazon has the Van Ness Enclosed Sifting Cat Pan/Litter Box (Extra Large) for $15 with free shipping on $25+ or with Prime. Comes with 1 sifting pan, 2 regular pans and a hood top with 2-way door. Measures 21.5" L x 17.5" W x 19" H and is ideal for larger cats and multi-cat homes.