Always great to have all the articles from one year of the Xojo Developer Magazine in one book, where you can just browse through when you have some time in your hammock.
We'll give away a few over the year at various Xojo meetings, once they start to take place again.
If you like to get one yourself, you can order them in the XDevMag book store.
When you consider ordering them, better pick several years and let them ship together at a package price. There are also academic and subscriber discounts available.