EDIT: I have Gjallarhorn myself, I bought the game two weeks after release therefor missed Xur when he sold it, I got lucky on the witches phase this week and got blessed by RNGesus himself.
I'm just curious as to what the general census would be if he sold it again!
EDIT 2: Personally I would throw my strange coins at him like the dirty whore that he is and get one for all characters.
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I have two so I would be disappointed but I wouldn't mind him selling it if it came with some gauntlet engrams