Is the book free?

Yes. However, voluntary donations are accepted. Proceeds from the donations go towards charities in India and the USA.

Is there a print edition of this book?

There is none. Paper making is one of the largest polluting industries (right alongside the fashion industry). Therefore, there will not be a paper edition of this book. And yes,  hosting this on a server (within a data center), is itself a polluting industry. So, there is no avoiding some level of damage.