Just bought 6 exotic helmet engrams from xur for 138 motes of light. Hopefully one of them will be Helm of Saint-14.
Update: I FINALLY GOT IT!! HOLY F**K DUDE YES!!!
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#Bungie
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Lol - I bought 12 to get it and nothing for the first 6 then it was the first one on my second batch. So let's just say I bought lots of shards and a helm of saint14