The best drop rate I've found is from the Zaxxis Raiders in the Heap, southwest of Area 52. Much higher than anywhere else, despite what Thottbot said about it... --Azaram 13:17, 31 October 2007 (UTC)

I found this myself as well and just to clarify why recorded drop-rates are not accurate for this item please see some information below.
A player has to have the quest A Mission of Mercy completed and be honored with the Consortium before the [Ethereum Prison Key] will drop to begin with.
In addition many players when they first arrive in Area 52, will kill Zaxxis Raiders for their Insignias which are required for the quest A Heap Of Ethereals and the repeatable follow-up quest Another Heap Of Ethereals. Players are usually not honored with the Consortium at that stage and/or most likely have not completed the prerequisite quest yet.
However, once players get to the Voidwind Plateau area, they are already Honored with Consortium and are on or already have completed the prerequisite quest mentioned above.
Bottom line is that for the [Ethereum Prison Key] and other items of that nature recorded drop-rates on any of the websites like Thottbot, WoWhead or Allakhazam can never be accurate for the above reasons and most likely many other factors.
Gontronix (talk) 12:32, 27 August 2008 (UTC)
Community content is available under CC-BY-SA unless otherwise noted.