I feel so stupid right now! I went to determine postage on the invites that I ordered thinking that it would be determined by weight. Oh no, my envelopes are .5" too big to be considered an envelope and will need to be sent at the flat rate. So instead of $0.44 a piece it will be about $1.60 per invite which when mulitplied by 200 is A HUGE difference. I'm hoping I can exchange them for a different format to be able to send at the lower rate.
O and order stamps now as the rates are increasing in January. There is a nice forever stamp with white roses (<<--Clicky) on them that look really formal and nice for a wedding. Don't forget about thank you notes too! This could save a lot of money.
Hope this helps you guys save some money (and stress)!