TOPS learning systems has a series of 48 workbooks for all variety of math and science topics. Their premise is to have kids doing hands-on science and math activities using simple materials.
I have a copy* of Scale the Universe (#44) and I really enjoy all of the printable, ready-to-use pages. I can attest to the use of very simple, common materials. There's some fun stuff in there.
Even if you're not interested in purchasing the books, I would recommend checking out the website. There is a free sample lab available for each of the book titles - that's 48 FREE LABS! Look through the available labs and see if there's anything there you might use in your classroom!
*I was given my copy free, while attending a workshop.