My advisor accepted an invitation to give a talk at a conference and subsequently instructed me to prepare a submission and deliver the talk instead, since he would be unable to go. I am happy to do this, but the registration for the conference costs over three hundred dollars. As soon as I brought up the issue and tried to get him to approve the reimbursement paperwork, he simply stopped replying to my emails. He isn't on campus so I can't ask him in person. I am pretty sure he wants me to pay the expenses myself. Is this normal/appropriate? Am I being unreasonable? I will probably just end up paying, but I wanted to do a sanity check and see what other people think.
