Any experience with HDI-SCA?

So I just moved to the DC area because my wife got a new job. I've seen a few places (mostly .gov contractors) that are requiring this for some ridiculous reason. I can't seem to find any real information on study materials aside from $1500 training classes on the HDI website. I really don't want to drop that kind of money on something so generally pointless.
Anyone know if there's a halfway decent book or something? Searching the forum for "HDI" returns search criteria either too short or too common to show results.
Anyone know if there's a halfway decent book or something? Searching the forum for "HDI" returns search criteria either too short or too common to show results.
Comments
I still have the book in PDF format.....if you shoot me a message with an e-mail attached......you know the drill