For in-store pickup only, and with stock varying by ZIP code, Walmart offers the Petmate Arm & Hammer Large Sifting Litter Pan for $16.83. (Amazon charges the same with free shipping for Prime members.) That's tied with our April mention and the lowest price we could find by $7. It measures 18.9" x 15.2" x 7.9" and features antimicrobial protection that inhibits odor.