Nadril: http://www.guildwars.com/faq/default.html Edit: (from the guild wars FAQ) How much will Guild Wars cost? How much will additional chapters cost? Guild Wars will be priced at a comparable cost to other first-tier PC games. The subsequent chapters of Guild Wars will also be comparably priced in relation to other games. and the invitation thing i read about on another forum, which said, if another member of your guild had the expansion/chapter of the game that you didnt, you could be "invited" to play while they are online. or something like that.