Stamps in the mailbox?
My SIL lives in rural Oklahoma. She told me that her mailman leaves U.S.P.S. envelopes in her mailbox for her use to buy stamps. She said it's got various choices listed on the envelope to buy different amounts of stamps and their prices. So when she needs stamps, she puts a check in the envelope, leaves it in her mailbox, and when the mailman comes he takes the envelope and leaves her stamps.
I've never heard of such a thing! Is this exclusive to Oklahoma?