Question
I feel like giving it for free to as many people as possible, however the changes of getting it in the hands of as many people as possible may be very costly and if I sell it then that can cover the costs of reaching more people with the message.
Answer
You can make the book a PDF and send it via email for free. Or publish it on Kindle and make it free or $0.99. Then you can make the paperback edition cost a few bucks for those who choose to forego the free option.