Are you talking ebook or print? If an ebook, you can download the mobi of your book at the Preview step and side-load it to your Kindle, or email it to others. But note that others can then easily copy it.
If print, Amazon isn't going to give you free books which cost money to produce. On CreateSpace, you can buy your book for the cost of printing (plus shipping). On KDP-print, you have to pay whatever price you set on Amazon. (You can lower the price to the minimum to get copies as cheaply as possible, but anyone else buying a book while the price is down would earn you zero royalties.)