Textbook costs and open-source alternatives is one theme that pops up here frequently. Here is a blog post (business1001) commenting on the California initiative to make open source textbooks available.
Contained within the post is a link to an initial evaluation of some options. Here is the summary for for the submissions from different publishers. I find it interesting to actually review the products (I tend to look at the biology resources because that is the area in which I was originally prepared to teach on the secondary level). Download the 600-700 page e-books.
