This week's book giveaways are in the Scala and Android forums. We're giving away four copies each of Machine Learning Systems: Designs that scale and Xamarin in Action: Creating native cross-platform mobile apps and have the authors on-line! See this thread and this one for details.
i think its better if you buy the hard copy, believe me, its totally worth it.
reading a book from the screen is tiring and annoying. for me i couldnt even read the notes i found on the faq page from the screen, i just printed them out.
so either you buy a new copy or used from ebay. or try to look in the public library. good luck