Oh and Ebay is great place to get books. Engineering books can be had for an extraordinary discount. I remember getting a couple books 75%-80% off what they were charging at the book store; Some came in only SI units but a little extra work converting for those kind of savings were worth it.
Just used DealOz.com and that's the way to go- found me the best deal on a textbook. Ended up being on ebay, but DealOz did the searching for me and saved time.
Rent your textbooks for free, just pay for shipping. Ground (3-7 business days): $7.99 2nd day (1-2 business days): $13.75 Next day (1 business day): $20.75 All you have to do is become a fan on Facebook. Link Pugs