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I already posted one similar to this that I found for the three campaigns, but I just found another one that is only for the original campaign. Like before I'm not sure if it works or not, but I figure it's worth posting in case someone wants to try out the game. The website is: www.guildwars.com/promos/gwtrial.html
1) 7DDH8 - CG92R - G9GP4 - NF6HD - NLHJ