Guild Wars In-Game Store

The Guild Wars Official Store is an internet-store for Anet's Guild Wars related products, accessible by the client itself. Accessed from the character selection screen, it offers additional campaigns, character slots and other upgrades. All purchased goods are automatically added to the account that has been used to log into the Store, so there is no physical shipping at all. The only way to pay is by using a credit or debit card.

Campaigns

 * Prophecies (49.99 USD / 44.99 EUR / 29.99 GBP)
 * Factions (49.99 USD / 44.99 EUR / 29.99 GBP)
 * Nightfall (49.99 USD / 44.99 EUR / 29.99 GBP)

PvP Editions

 * Prophecies PvP Edition (39.99 USD / 35.99 EUR / 23.99 GBP)
 * Factions PvP Edition (39.99 USD / 35.99 EUR / 23.99 GBP)

Upgrades
Was before also:
 * Additional character slots (up to a total of 32 slots, 9.99 USD / 8.99 EUR / 5.99 GBP each)
 * PvP Unlock Packs (9.99 USD / 8.99 EUR / 5.99 GBP per profession, or 39.99 USD / 35.99 EUR / 23.99 GBP for all six, Prophecies skills only, elite skills included)