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Your options for finding it yourself are farming Battlefields of Eternity in Act 5 including the Abandoned Siege Camp in the area.
You canalso Try farming the rare vendors in Act 1.
Fields of Misery - House of Curios rare event spawn.
and
Southern Highlands - Watch Tower Level 2.
Both vendors have a chance to sell white Ascended Shields and their inventories change every 15 mins.