Sell Stalhrim Armor and Weapons to Ancarion

Walkthrough
During A New Source of Stalhrim, should the Dragonborn decide to help Ancarion acquire Stalhrim weapons for the Thalmor, this quest will come up.

Sell Stalhrim Armor and Weapons to Ancarion
It is entirely up to the Dragonborn to sell anything at all to Ancarion, but now it is possible.

Verkaufe Stalhrim-Rüstungen und Waffen an Ancarion