I'm very sure that it is real. I can't imagine that they sell a print for 100 Dollars. I mean, it is an official dealer who is licensed by BJ and not something illegal.

To answer your last question: No I wouldn't buy an autograph. A bought autograph wouldn't mean that much to me. Behind the autographs I have there's always a history how I met them. It's not just a piece of paper with a signature. For me the history behind the autograph is more important than the autograph itself.