Ok, I am sending out about 400 invitations. For just the outer envelopes it will cost $168 if it is standard weight or 232 if its over standard weight. (I am weighing them this weekend.) So for 800 stamps it will be $336. Is it wrong to not put a stamp on the RSVP envelope? Or should I spend the extra money and put a stamp on them? I know with the people from work I wont be putting a stamp on the main envelope since I will just handing them their invite. Should i put a stamp on the RSVP one though? HELP! 