I've only been to one horror con sadly (hope to be more someday), but they had photos there to sign and sell. I mean you could always bring an autograph book or print your own photos just in case and bring with you. I've also seen some people who do art bring their work and have the actor of the character drawn sign it. And they usually have you pay to so much as take a picture of them (I got a photo of an extra from Walking Dead for a friend for free and he was great, but the others there asked for money before photos), so keep that in mind when you're packing spending money. Have a great time!
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