this does not look good.
 First, you can buy them from other sellers listed on Amazon or other places for about 1/3 of the price.
 Here are two sites you can search for cheaper books.
 www.campusi.com
 www.addall.com
 I do not think you actually paid that much since everyone who ever bought books online never goes for the listed price. It is just stupid and ridiculous and crazy.
 Second, you can also get international edition (paperback) from Taiwan or India for about RMB250 if you know someone there who can buy and mail you the books. The bookstores do not take online orders.
 Please do not sell photocopies here to make money here anymore.