Hey, I went on a global search for the stuff after reading that book (Richard Windrow?). After six months I FOUND IT!!. It's a British site called Antenocitis. Try here. Down the page a click or two. It's cheap. I bought 10 bricks of it, should last a couple of lifetimes. If they don't have in stock anymore, PM me.
Steve
***EDIT*** - Hey grizz, upon looking at the site again, I see that they don't have any in stock. PM me, I'll hook you up.