The infamous WG7 Castle Greyhawk is newly available in pdf from dndclassics.

The infamous WG7 Castle Greyhawk is newly available in pdf from dndclassics. Other recent releases include I3 Pharaoh, X1 Isle of Dread and WG4 Forgotten Temple of Tharizdun.
http://www.dndclassics.com/products_new.php