I recently purchased this book on E-Bay and find in invaluable for the collector.The book is published annually by Ron Cartlidge from Austin Texas.
The contents of the book are magic props, books, ephemera, videos, magazines, collectibles etc...
that were purchased on the following auction sites,
Ebay, Martinka, Magicauction.com, Swann Galleries, T.W. Conroy, Lone Star Magic Auction & The Great Houdini Auction
The book is actually a price guide of used magic and if more than one item was purchased he lists the different prices which give you an estimated value of its worth.
The book is softcover 120 pages and retails for $30.00, the 2006 version will be available after the 2006 collectors meeting.I believe the 2005 book is still available if interested let me know and will get contact info ..
Rennie

Great idea! I see that Ron has released a 2008-2009 version, wondering if he's releasing them less often now or if there's a 2010-2011 version in the making.