While I was sitting on the toilet reading the weapons booklet that comes with the limited edition of Destiny I came across something xurners won't be pleased about... on page 44 it states Gjallarhorn will not be given out. It must be "earned".
haha
Edit*
I understand Xur has sold it, but if you had enough strange coins week 2 you "earned" it.
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It was a nice way to give to early adopters to the game, they definitely earned it.