MoosMom- that is a great idea about the ionized air-filters. I have been thinking about that too, but did not know if they worked for litter box oders or not. It's great to hear they do!
That also sounds like a good price- many are much more expensive.

S&S- I have used a product called Odor Free for my cats. It is a spray that you put on their food, and takes away alot of the waste odors. Tastes like fish to the cats, so they like it.
It is also safe for them, as it is made from Yucca extract and water.
Got it at Petsmart.