I am looking for advice on whether or not to include stamps on the RSVP cards for guests to return to us. I am giving them the option of RSVP online or by returning the RSVP card because I know some older people may be resistant to RSVP online. Since I expect that a lot of people will RSVP online do I put a stamp on the return RSVP card? I really have no way to tell who will do what and stamps can get expensive so I don't really want to waste the money if I don't have to. Has anyone been in the same position?