I bought a lot of the costly toys like the 2 mice for $4.99 (or should I say rip-off toys?) lol and after all the different kinds, one day I bought some on clearance from walmart - .25 each for these larger mice wound in twine - and it seems those are the only things the cats play with now. It figures the cheaper stuff would be their preference LOL
I also like the catnip bubbles, those are fun, or getting them with one of those bubble blowers you can find really cheap that work on batteries to create lots of bubbles.
Plus, you could save the plastic rings from your milk and throw them in there, they love those too, and moreso I think than the "manuactured" ones from the store that are a bit thicker.