Today is the day the United States Post Office raised first class letter stamps one penny to $.46 per stamp. If you are mailing save the dates or wedding invitations that have pre-stamped envelopes, please make sure you have the correct postage.
On May 11th the price for a 1-ounce First-Class Mail stamp will increase from 42¢ to 44¢. If you are sending out your wedding invitations in March or April and pre-stamping your reply envelopes where they may be coming back to you after May 11th, you should head to the post office to purchase the Forever Stamps. This will eliminate any replys getting sent back to your guests for improper postage.
You can buy the Forever Stamps at the Post Office or at their online store.