BTW cash in mail is for idiots. No one does that. Much better to find a local bitcoin dealer and pay a reasonable 10-20% fee.
It is not stupid. I have done it many times, and the cost is generally under 5%. Just last week I sent $500 overnight, for $20. That is 4%, and normally I would go with a cheaper option, but the guy I was trading with was in a hurry and paid for it.
Why would you pay 10-20%?