My Kitties Need Some Stuff, But What?

I have the two most beautiful and sweet kitties--shalpoo and scarpoo. They are almost a year old, but are still acting like kitties. They are good for the most part--until they run through the house at all hours chasing each other and jumping up and down on the high furniture. Sounds like a basketball bouncing when they hit the floor. My downstairs neighbors must love that. But they are sweet, and I need to get them some new toys. I am going to the pet store tonight. Maybe I can pick out some cat supplies and toys that will keep them occupied and happy.