I stumbled upon a litter box unlike any I've seen before via Petmate.com. The Booda Dome Clean Step cat litter box is a covered litter box that has a built in ramp which helps eliminate escaping litter and keeps your cat's paws clean. Surprisingly, this litter box is 99% odor free.
The first thing I noticed while opening the package was a fairly large charcoal filter that attaches to the top portion of the box and is UN-noticeable when closed. This style is a little larger than your typical litter box. I wouldn't recommend it for a smaller apartment. However, for a typically single family home or larger this would be perfect.
The Clean Step litter box has an average retail price of $42.99 and can be purchased at stores such as Petco, and Walmart. As well as online at amazon.com. And is available in three different colors — pearl, titanium and iris.