Knightfall
World of Kulan DM
Thanks for the info.A quick look at ebay showed a couple of them for sale. I've got three copies myself and while it has never been common it seems that there is always a few for sale there and other places like Noble Knight and Troll and Toad. The modules and supplements are a lot rarer and harder to find though.
I have a set of the Thieves World novels, but I've yet to start reading them. Once I do, I likely become more interested in Theives World.