Standard $50.96
http://www.greenmangaming.com/s/us/en/pc/games/mmos/guild-wars-2-digital-edition-na/
Deluxe $67.96
http://www.greenmangaming.com/s/us/en/pc/games/mmos/guild-wars-2-digital-deluxe-edition-na/
And its a legit retailer
https://buy.guildwars2.com/en/retailers
Several sellers, including Amazon, are selling in $18 range
X360 - http://www.amazon.com/gp/product/B003GSZ9ZE/
PS3 - http://www.amazon.com/F-R-3-Playstation/dp/B003GT8IL0/