It's hard to state a rigid price on this one. Everything within $50-$120 should be in the right ballpark I'd say. Of course, Bucky might sell his for $200+ but this is another story.
I traded some stuff to a guy who traded some stuff to another guy who traded some stuff to me that somewhere in there a Kid Icarus GB CIB was exchanged. I think it was valued ~$75 at the time, which would be 6-7 months ago. I'm fairly certain it was in really nice shape.
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And you're right, if Rarebucky were selling it, just use this formula: going rate X 'Buckiplier' (3+) + inconvenience fee = $450
I need to round up all of my old GB stuff the next time I'm back home and get it out there in the open market