What is the price of francium?

This might be a disappointing answer, but Francium is so rare that it isn't usually sold. So if you're looking for something about the price of Francium for a school project, you can just write about Francium's rareness. Your teacher would understand, don't worry! Personally, I think that even if Francium was out for selling, it would cost a lot of money. Just trust me! If you don't believe it, then look around the internet. You may not be able to get the answer.