I'm going to eventually buy this third grade algebra program. http://www.borenson.com/ It uses a plastic balance beam and dice and game pieces.
And there's a book called calculus by kids for kids that teaches fractions by shading in squares on graph paper with different colors. I just remembered to post them here. It will be a few years before I buy them.

Youth lives by personality, age lives by calculation. -- Aristotle on a calendar