We use priority flat rate shipping with the USPS. Sometimes the order calculates the correct box to use. Sometimes we can ship in a smaller box or envelope (for lip balm). If we can reliably ship for less, I will try to do so and refund you the difference. So if you get an email saying we refunded you some money, that's why! We're not trying to make extra money on shipping. We charge you exactly what we pay.
I try to ship by the next day (except if you order Friday night, then I'll wait until Monday to ship). If you get your order in before I've run to the post office, I will ship the same day.