Where to buy a cat tree?

[torinsmom]

So, follow up to the self cleaning litterbox. I realized after a week of using it that the litterbox area was more stinky than normal. It seems that some smaller clumps go through with the clean litter and then get trapped in the area where the clean litter goes when you roll the box. I have tried different things but nothing works. I am spending more time cleaning that box than my regular box, so I am taking it back to Petco. Too bad, it's a great idea, but it needs some tweaking.