If you place an order by 4:00 (est), we will usually have it out the door that day. Though, just make sure that none of the items are marked in red during checkout. This would indicate that the product(s) is back-ordered and will delay shipment.
USPS' domestic Express Mail is usually overnight. Though, depending on your location (We are located in Georgia), it could take 2 days. In order to assure that your package will arrive overnight, I would go with Fedex overnight.