http://www.washingtonpost.com/blogs/federal-eye/post/postal-service-says-stamp-prices-are-going-up/2011/10/18/gIQAriktuL_blog.htmlUSPS will be raising some rates beginning January 22nd. This includes the 44cent stamp up to 45 cents. You may want to keep this in mind for not only your invites but RSVP stamps as well depending when your RSVP date is!