$1.13 Stamps for Wedding Invitations
If you are mailing your wedding invitations after January 21st, 2018 and it weighs 3.5oz you will need a $1.13 stamp to mail it 1st-class. This is also the stamp you need if you need to mail a 3 oz letter that is odd-sized/non-machinable. Be sure to double-check the weight of your invitations with your local USPS post office.
Zazzle offers thousands of designs for wedding-themed $1.13 stamps as well as all other first-class face values that are approved by the USPS.