It's down all on shards for a reason.
My guess is Bleak or Kyronix have taken the search down in order to run maintenance on it. The same thing happened a few months ago when people complained of issues. Lately there have been a plethora of issues with the vendor search.
Don't you guys just love the communication?
I guess they figure that about the time people start complaining about it will be back up and running so no need to tell the playerbase what is going on.