How do you say “free” in Italian?

It turns out it's gratuito. I looked it up because Amazon has made The Sixth Discipline free in the Italian Kindle store! I'm not quite sure why the book is free in the US, UK, Canadian, and now Italian Kindle stores, and not the others, but I suspect it's because someone in those countries clicked on the “tell us about a cheaper price” link. Brazil, Japan, Spain, Germany, France, and India, it's your turn. Demand my book to be livre, 自由に, libre, kostenlos, librement, and मुक्त!