Most books are available in three formats: PDF, paperback, or hardback. See descriptions regarding particular titles. I have made the PDF versions available with somanauts abroad especially in mind, as prohibitive postal costs prevent me from shipping books overseas.
The Integral Anatomy Series was originally published as a set of 4 DVDs, before I decided to make it available to view for free online. A very limited supply of physical DVD sets still exist for those who have no internet connection, or are just into collecting old-school physical media! I have no plans to reprint on plastic ever again ;)