Programming LiveCode can be ordered from the website. On the right (on this page) you see a link labelled "Go to main site". If you click on it, you go to a site with several icons. Click on the Buy icon to go to the order page.
Buying the book from the website is the quickest and easiest way to buy the book. If you give a book store the ISBN number 978-90-820741-0-9 they should be able to order the book for you, but it will be much slower than if you buy the book from the website.