If you're mailing your invitations in the metro Detroit area, the Troy post office will hand cancel if you bring them in early in the day. They were helpful and pleasant unlike the other 3 post offices I tried before them. Also, if your postage estimate seems too high when you get them weighed, check with a different post office. I had a clerk in Royal Oak tell me it was going to cost $1.30 to mail ours. Berkley and Troy both said .85 and they arrived perfectly with that postage.