Throughout Aatmaavrajanam you will see references to publications recommended for your reading - particularly on Textual Tuesdays! Where anything written pertains to texts covered in Chapter One of the blog, links to the relevant posts there will be given.
However, you may also wish to purchase your own copies of the texts to read at leisure. To do so, you are first directed to the Chinmaya shops so you can buy directly from them.
Chinmaya Publications West - based in the USA.
CM Vani - Indian publishing
Then you can also contact the centres pertaining to your closest region (these are clickable links):
Which is fine for hard-copy of books.
If, though, you prefer e-book versions, then it is possible to obtain quite a few from Amazon.
This link will display most of them (with a few incursions from elsewhere).