Don't for a second think priority mail is any faster. We were on vacation a couple of months ago and I forgot to mail in the house payment before we left. When we got home it was the 3rd. If payment is received after the 10th a late fee applies. So I went to the post office and sent in the check via a priority flat rate envelope just to be safe thinking it would take 2 days. Bank did not receive it until the 9th. It normally took 3 days via normal snail mail.