Cathole  
   Hides the box behind a closed inside door. Removable brush collects loose cat hair.
   http://www.cathole.com/

Innovative Convenience Products, Inc.  
   Manufacturing a litter box with a entry through a hole on the top, keeping odors, litter and waste inside. Shipping to US contiguous states and Canada.
   http://www.clevercatbox.com/

KittyMaid  
   Mat which eliminates tracked litter.
   http://www.kittymaid.com/

Litter-Robot  
   Automatic, self-cleaning litter box with large capacity.
   http://www.litter-robot.com/

CatSheets  
   Sifting liner sheets for the litter box.
   http://www.catsheets.com/

Litter Lofts  
   Designer litter boxes shaped like doll houses, cottages, farms, and log cabins.
   http://www.litterlofts.com/

Scoop Coop  
   Designed litter scoop with a mouse shaped holder.
   http://scoopcoop.com/

Telar, Inc.  
   Silica sand based cat litter which eliminates the odor.
   http://www.freshmagic.com/

Poopsie Cat Litter Boxes  
   Easy to clean litter boxes designed for regular clay or clumping litter. Also selling oat grass seed to grow for cats' consumption.
   http://www.poopsiecat.com/

Litter Welcome Mat  
   A mat to reduce litter box track in your home.
   http://www.litterwelcomemat.com/

Odor Lockers  
   An ecologically friendly, flushable cat litter, designed specifically to control the odor of cat urine in litter boxes.
   http://www.odorlockers.com/

Wright Innovations  
   Offers a rechargeable carbon-matrix fabric, in the shape of an igloo tent, that covers the litter box and absorbs odor.
   http://www.tabbytent.com/

Cat Litter Box by C.A.T.S.  
   Cat litter box specially designed by CATS in Cawston British Columbia, Canada.
   http://www.house4cats.com/

Litterboy.com  
   Automatic cat litter boxes and accessories.
   http://www.litterboy.com/

The PurrFect Box  
   Offers poly-coated, collapsible, disposable cardboard litter box.
   http://home.earthlink.net/~katieent/

Kitty Kozy  
   Slipcovers for litter boxes. Machine washable.
   http://www.kittykozy.com/

C and G Gifts and Collectibles  
   Handpainted tri-fold wooden screen to conceal the litter box and give kitty privacy.
   http://candggifts.com

Cat Cottages  
   Kitty litter pan covers shaped like English Tudor cottages.
   http://www.catcottages.com/

Harrisworks  
   Wooden cabinets to conceal litter boxes, with side entrances and a sliding tray.
   http://www.catlitterfurniture.com/

StuffWeUse.com  
   Cat litter made from corn, food, hair lifter, and vitamins.
   http://www.stuffweuse.com/

Notso  
   Features a litter sifter for litter box cleaning.
   http://www.notso-ltd.com

Meowt House  
   Litter box enclosure. Includes product description, pictures, FAQs, warranty information, and installation details.
   http://meowthouse.com/

Evaporator Litter Box  
   All natural odor free cat litter box. No moving parts, using natural air flow. Includes product description and comparison chart with other brands.
   http://www.hydrolasvegas.com/evaporator/

Cat Litter Shop  
   Offers litter pearls. Includes testimonials and product details. UK shipping only.
   http://www.catlittershop.co.uk/