What is Linda Hamilton, Gillian Anderson , Robert Patrick & Carrie Fisher charging for autographs at this show.
Can you get a photo with them at their table with your own camera after purchasing an autograph.
Can't speak to $ for those guys but so far as photos it's a mixed bag. Generally they won't do posed photos (although some will) but I've found that most don't mind if you snap a shot of them signing whatever you've brought. I usually go to these things with a friend and they take some photos for me.
In some cases the handler will stop you. I imagine GA will be like that and maybe CF but I can't imagine those others will be bad.