Back on January 28, 2013 new postage rates were provided here on the Paper Passionista blog, and here we are go again, one year later, with more increases. The new postal rate chart is provided below, thanks to our friends at weddingstamps.us. One thing noticeable, besides the new rates for weight of mail, is the service charge for anything "odd shaped" has gone up from .20 to .21 (think square).
As we always advise, be sure to take your completely assembled invitation to the post office and have it weighed and get a postal employee to quote you on what it should cost. As I learned the hard way when mailing my own invitations this past year, it's not a bad idea to take your invitation to two different post offices and see if there's agreement on what they should cost. I put on the postage my local postal clerk told me I needed, only to have 1/2 of them come back returned for postage. Turns out my envelopes were considered "large envelopes" rather than odd size by some of the post offices, making a difference of about .40 each. Had I not been told it would be treated as an odd size envelope rather than large size I would have put more postage on them to begin with. Don't suffer the same sad outcome I did. Better to be safe than sorry.