OK so it may not seem like a big deal but I'm stoked. I just took my invitation mock up (nothing printed just the weight of the papers and envelopes) to the post office. I had it weighed with 3 insets (rsvp, directions, and accommodations) it was 1.1 oz which would have required a 70 cent stamp. i took out one inset and then it went to 1 oz exactly! Yay for my LOVE forever stamps.
So now i think i may use a slightly lighter weight card stock for my insets and combine directions and accommodation info onto one card. She did say at first it was rigid which means it would cost more but I took it and was bending it back and forth and said "no see, it bends, its ok im not mailing this one" 
I opted for a 4x5.5 A2 size pocket invite from cardsandpockets
Win for postage!
