[gwynevans]

Originally Posted by ATDrake

Humble Book Bundle Hacking presented by No Starch Press

I'm no specific knowledge aware of the others, but these two - "The Art of Exploitation & Practical Malware Analysis" - at the $15 layer are decent Reverse Engineering/Exploitation/Malware Techniques titles, if you're interested in finding more about that sort of thing (and how to try to prevent it).