Here's a little tip. Every month the University of Chicago Press lets you download a free ebook. If you go to this page, you can put your name on an email list and they'll let you know when a new book is available. The current free book (for January 2014) is Murder in Ancient China by Robert Van Gulik. According to the press, the book is "available on our website DRM-free in your choice of an EPUB file (for most e-reading devices, phones, and computers), as well as in a PRC file (for the Kindle). Or, you can get Murder in Ancient China free thoughout January at leading e-book retailers, including in the Amazon Kindle store, at Apple iBooks, and at GooglePlay."