Target.com has the Dungeons and Dragons Art and Arcana [Special Edition, Boxed Book & Ephemera Set]: A Visual History on sale for pre-order for $76.27 + tax. Shipping is free.
This is the lowest I have seen the special edition of this book that includes ready to frame prints, modules, etc. Amazon still has the pre-order at $112.50 although it did dip to $75.00 back in June.
D&D Art and Arcana Special Edition
http://www.target.com/