Discover a wonderful selection of rare and collectible books, used copies, signed and first editions and more, from booksellers located around the world.
www.abebooks.com
I would also keep an eye on Thriftbooks. I am pretty sure you can even put in a "request" there for someone that might be sitting on it and just hasn't listed it yet.
I have used both sites. They are slow shipping because they use the post office. They are a site for third parties to sell on. But take good care of customers if you have issues. And everything I have ordered has been as described or even better. (Autographed copy)