We're about to send out our very late STD's and about to go purchase stamps for them and the invitations so we don't have to make multiple trips when I just realized about half my invitations are going international (Canada). How does international RSVP postage work? Can I buy Canadian stamps in the US? Do I have to have a family member purchase them there and send them to me to put on the RSVP envelope? Just put no postage on their RSVPs and make them responsible for return postage? Majority of the Canadians are of the older crowd, and several don't even own computers, and I think they would go the traditional route of returning the RSVP through the mail as opposed to "using these new fangled technology things."