I can't remember when I bought my litterboxes, so I guess it's time to replace mine as well. I might just replace one at a time (I have 5 ) which can get a little expensive.

I was eyeing one of those round Booda boxes last night at Petco. It's sort of self-cleaning. It has a tray the clumps land in that you pull out and dump. Pretty cool! Anything to help my litterbox chores .