In the latest build for Patch 10.1 PTR, there has been a major change to Elemental Potion of Ultimate Power. These potions are no longer BoP and can be sold on the Auction House.
Elemental Potions of Ultimate Power
In Patch 10.1, Elemental Potion of Ultimate Power are no longer Bind on Pickup. They will now be able to be sold on the Auction House like the other Elemental Potion, Elemental Potion of Power.