I'm not sure if it's obvious or not, but PDF's of many popular textbooks are widely available either free as in beer: http://infolab.stanford.edu/~ullman/focs.

I'm not sure if it's obvious or not, but PDF's of many popular textbooks are widely available either free as in beer: http://infolab.stanford.edu/~ullman/focs.html http://infolab.stanford.edu/~ullman/focs.html http://www.cs.berkeley.edu/~vazirani/algorithms.html http://www.cs.berkeley.edu/~vazirani/algorithms.html Or free as in money from a bank robbery: http://thepiratebay.org/browse/601/0/7 http://thepiratebay.org/browse/601/0/7