My copy was missing one of the octogonal tiles, any idea how to contact R&D games in order to get a replacement?
Contact Richard Breese, his information is in the BGG database. He designed the game and he and his wife own R & D games.
Keep in mind that you are trying to get parts for a game that came out in 2002 from a small company run by people who do it part time. I would really be surprised if any company has parts laying around for OOP games for 10-15 years.