With orders of $25 or more, Amazon offers the IRIS Split-Hood Litter Box for $6.06 with free shipping. That's the lowest price we could find by $5. It measures 19" x 15" x 15.5" and features a hinged door, door step grate, and litter scoop.

Note: This item is part of Amazon's "Add-on program" and can only be purchased with an order of $25 or more.