Is it possible to buy prophecies via download

I have a factions-only account, and I noticed that most of the good skills for pvp are prophecies only. ALl the good builds I could find on the net have skills in the which aren't available in factions. So I'd like to get prophecies but would rather purchase it via download that buy it from the store ...

You should be able to go the the main guildwars site and purchase it, yes. All you really need is the prophecies unlock key, then you can merge it with your existing account. (The software is already on your hard drive for both versions of the game)

*edit* Well, not directly from the main guildwars site... http://www.plaync.com/us/games/gwp/buy.html