Original art and maps for the Tonisborg book are now for sale at the Secrets of Blackmoor Website. Most interesting are perhaps the original David Megarry hand drawn maps. According to the website, "all preceeds go to the artists". Starting bids range from 150-300 USD.
See anything you fancy? Go here for the auction site.
More discussion of this auction here.
Oh, and if you are interested in a Blackmoor map signed by Dave Arneson, this might also be of interest to you. The seller of this map is Brent Chumley who made the map for the D20 Blackmoor Softcover edition.
-Havard