Do you think he should? I know I need one.
Edit: I'm seeing a lot of "Bungie said it won't be sold again" or "it'll get nerfed if everyone uses it". Please stop. That never happened with the Ice Breaker. People said it would get nerfed when everyone used it, but it never was. People said Xur would never sell it a second time, but he did. Until you can link to an official Bungie statement on those issues, no one believes you.
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Nope he should not sell it. Just like the vex will not be sold, the Ballerhorn should strictly be a drop. Funny though you can spec my characters and they all have Ghorns. I've had them since the beginning and most, if not... ALL of my clan has at least one. However I've never been dropped a vex and I'm pissed because I need it for the collection. That is the only exotic I am missing (hawk moon and Monte Carlo because I'm on the xbox360 / one). So yeah, let it stay as is, all who have it got it and appreciate it because it wasn't bought.