Hello, I am Renato, an Italian teacher.
I would present you my new idea that is famous in Italy. It is the Times Table, a gadget that allows to practice on multiplication in a self-control way.
You can look the gadget and its working on youtube:
What do you think of my idea?
I search an american dealer
In Italy is sold by GhenosGames, it is the link of the page:
Thanks for your interest!