Just kidding. It is indeed a fine volume and I would never part with mine. I'm serious. A significant waypoint on the journey.
But I believe the books have been going on ebay for substantially less than the original purchase price.
Plus of course, as has been stated many times, you can borrow it FOC from your library.
If you're interested in purchasing a directorship of DSI then I suggest you contact Steve Copan o Active Technology who I think may be able to assist you in that endeavour. Or even contact DSI directly. The going rate was $10,000.