What is your cost of developing negs? Contact sheet? Basic set of prints for viewing? Are you doing all of this yourself or being sent out? In NYC that would be somewhere around 20-25$. Cost of film itself 5$ I would also have thenegs scanned at time of developing so this also might increase price. All this done and you are at 25-30$. Now your time? If they are coming to you 2 hours if I was going to them 3hrs. I am not sure what the going rate is where you are but I would think that charging 25-35 an hour for your time would be reasonable.
Arthur