Catan: Seafarers 5-6 Player Extension - Titan Games
Amazon.com: CATAN Board Game 5-6 Player EXTENSION - Expand Your CATAN Game for More Players, Strategy Game for Kids and Adults, Ages 10+, 3-6 Players, 60-90 Minute Playtime, Made by CATAN Studio : Toys & Games
Traders & Barbarians Catan Game Extension - Buy at Into The Wind Kites - Buy at Into The Wind Kites
Catan: 5-6 Player Extension (1996) – Oxford Comics & Games
Amazon.com: CATAN Board Game 5-6 Player EXTENSION - Expand Your CATAN Game for More Players, Strategy Game for Kids and Adults, Ages 10+, 3-6 Players, 60-90 Minute Playtime, Made by CATAN Studio : Toys & Games
8 player Catan, equally distributed setup (no 2 same tiles next to each other) : r/Catan