Books

public domain

https://www.gutenberg.org/ - free ebooks, public domain
https://librivox.org/ - free audiobooks, public domain
http://bookzz.org/

private domain

We are unable to provide links to obtain books that aren't free. That'd be illegal.

places to actually buy books

http://www.amazon.com
http://www.dealoz.com/ - cheap books (untested!)
http://www.bigwords.com/ - cheap books (untested!)

other

http://www.sciencebuddies.org/science-fair-projects/top_science-fair_finding_scientific_papers.shtml

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