Guild Wars 2

I chose the Vigil with my Ranger & Order of Whispers with my Necro. However, I like the Priory weapons the best. I know the armor for each Order is specific to members, and I’m assuming the weapons are too. So…

Is it possible to join multiple Orders or still buy the weapons from another Order than the one I initially joined?

Not as of yet. there is a work around to get the armor/weapon skins from one order transmuted to use on another character however, haven’t tried it myself though. a vigil warrior could transmute a vigil skin onto a white item which could then be sent to your priory guardian and transmuted onto a new item with good stats. Like i say, I havent tried it myself yet, but reportadly it works

Choosing an order is a story choice, and like other story choices, it’s exclusive and permanent on that character. So short answer, no. And I’m pretty sure you can’t buy the weapons of an order you don’t belong to. Rehashed is right though, if you make a Priory character you could probably buy the weapons with them and transmute the skins.