WDW: Steve has three DVD's in his "The Naked Edge" series. They work in a building block fashion, like his live classes.
I have five of his printed books, there is a sixth out of print one I'm still working to track down.
My two favorite of his books are "Bringing a Gun to a Knife Fight" and "The Art of Disarming". His Karambit-specific book is "Mastering the Curved Blade". It's a good companion to the videos.
If you look on eBay, they pop up a couple of times a year. Good luck, I feel they are worth the effort to find.