A wonderful DIS'er is in Orlando right now, and has offered to mail me a coupon that I need from the Orlando Entertainment Book. We are leaving in about 12 days, so she needs to mail it right away so I will have it before we leave. The US Postal website says a regular letter, with regular delivery is .72. Can she just use regular stamps, and drop it in any mailbox, or does she have to mail it from a post office? Please help!