Can't buy Nightfall in In-game store...

In the In-game store I tried to purchase Nightfall, it asked me to create a PlayNC account so I created an account. Once I do that I click next, "Processing Transaction" comes up for a few seconds, then I get a popup saying "Network Error - please check your internet connection".

I was connected to the internet at the time so I don't know what else to do.

Is there a differenc ein price between in-game and store? If not, just go to a store .

http://www.guildwars.com/support/networknews/

Try again a bit later.

Wait like10 mins..then try it again (not the purchase though you dont wanna buy it twice)

Tried it again a few minutes ago, same thing.

Guess I'll have to buy it off eBay (stores sell for like $90AU).