I've found a design on VP for invitations that I love and the coordinated RSVP cards come with envelopes for people to send their replies in. We did postcards for our STDs and I wanted to do the same for our RSVP (but no matching postcards could be found.) I've seen the size of the card and it could pass for a postcard- and I can design it to have our address printed on the back. Right now, I'm planning to order the RSVP cards formatted as postcards but just curious if this sounds okay? Or should I just bite the bullet and pay the extra postage?
FYI- These are the invites and RSVPs