http://blogs.sitepoint.com/2011/01/18/great-deals-for-a-great-cause/

-Digital bundle of “Build your own Website the Right Way Using HTML & CSS, 2nd Ed”  
-Digital bundle of “The Principles of Beautiful Web Design, 2nd Ed”
-Digital bundle of “Build your own Wicked WordPress Themes”

For the next three days only, you can grab one of these for $9 OR all three for $18.

I bought all three, since I wanted two of them. My credit card company gave me some fuss since Site Point is outside of US, but other than that, the transaction was smooth and the pdfs are beautiful. Very easy to read too.