1. disposable cat litter trys with pre-filled cat litter, they only cost $2.00 at walmart which is cheaper than buying cat litter alone and all you do is swap it out with a new one when it needs changing!
2. tall cat tree with scratching post.
3. toys: "wand" type cat toys with feathers on the end and small furry mice.
my three things are:
1) cat towers (of course! LOL!)
2) a good cat food
3) plenty of things for my cats to do to keep them intertained while I am at work. (does that count?)
if not then #3 would be this site, I've learned so much here.