From AbeBooks.com, a list of The Ten Most Expensive Science Fiction and Fantasy Books Sold in 2006.
Some unexpected titles and interesting package deals.
e.g. #8
Where Late the Sweet Birds Sang
Kate Wilhelm
Near fine original manuscript package of this 1976 Hugo award winning novel. Contains: Original ribbon copy and carbon-copy typescript, final draft, setting copy. Signed with a few corrections in authors hand. Also containing file folder with maps, charts, diagrams, rewritten section and correspondence, all pertaining to the novel. Sold for $3,975