Traders & Barbarians is distributed as the third major expansion for The Settlers of Catan, although it is actually a compilation of small expansions and variants. (It is independent of the Seafarers and Cities & Knights expansions, but can be combined with them.)
All of the variants and three of the scenarios have been available from various sources in Europe and the United States or through official websites. The Great Rivers and the Fishermen of Catan have been expanded somewhat for this expansion through extra tiles and player pieces.