A good source of used books is often Amazon.com .
You have to remember that you will get charged $3.99 per book (=$4) for postage unless you order $25 or more all from Amazon. Then you qualify for free postage. The savings is significant. No tax.
The book you mentioned is about $12 new. New is cheaper for this book than used beause of the shipping charge.http://www.amazon.com/gp/offer-listing/0...p;condition=new
We have an excellent used book store in the city in which I live. It is one of the best in the country. But one still has to pay tax (10%). And you may find something one week and not the other.
If you mail me a wish list, I'll try to shop the used book store for you.
YOu just have to shop book by book and add them to a wish list until you get