$1.15 Stamps

If you are mailing your wedding invitations after May 31st, 2015 and it weighs 3.5oz you will need a $1.15 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 $1.15 stamps as well as all other first-class face values that are approved by the USPS.