At the time in May 2013, there wre only 450 copies of the full deck left in the Llewellyn warehouse. We're coming up on two years since then, and I secured one $40 copy of the full deck in a random bookstore this week.
I'd advise you if you really want it to comb through local New Age stores rather than the big businesses, and see if it's still on the shelves. Sometimes, small stores don't track what's OOP unless someone asks about it. If their copy of the deck sits there forever, they never have to check on it until they sell it, and they may not be aware of how much it's really going for now and that that was the last copy.