You can order the paper version of TLPI from No Starch Press at a 30% discount (i.e., US$70 + shipping), and receive the ebook free.
To obtain the discount (and free ebook), you must buy TLPI direct from the publisher's web site, and quote the coupon code Mamaku (what's that?).
No Starch Press is located in San Francisco, so international shipping rates will apply for readers outside North America.
You can order the book online at:
No Starch Press (see discount offer details above)
amazon.com (or here for the Kindle edition)
amazon.co.uk amazon.de amazon.ca amazon.fr amazon.it
Barnes and Noble
(If you're going to buy online, then using most of the above links helps improve my income from online sales.)
TLPI is available for sale in various ebook formats, including PDF, MOBI, EPUB, and Kindle.