The GW2 Facebook page had an update today announcing the retailers that you can pre-purchase Guild Wars 2 from!
Here is a list of retailers that will participate in the pre-purchase. This list is a work in progress, so we might add additional retailers to it the closer we get to the start of the pre-purchase on April 10th. Once pre-purchase is live, you will find the complete list including links on guildwars2.com, we just wanted to give you a headsup so you can pick the retailer of your choice.
Well this sucks, but I can't post a link to the wiki entry listing all the retailers, or the Facebook update because the link triggers the spam filter.