It's the week of Black Friday, meaning every shop in the States drops its prices for "reasons". We're okay with that though, so far it's meant lots of deals, a Steam Autumn sale, and now a chunk off prices in Guild Wars 2.
More on those discounts below.
According to the post over on the game's site "The Black Lion Trading Company is celebrating the biggest shopping day of the year with a Black Friday sale of their own.This Friday, Saturday, and Sunday, [...] three different items will be discounted up to 70% off!". Each days items will only be on sale for their allotted 24 hours so to get in on the savings ArenaNet want you to log in daily.
You'll find all the deals in the gem store.