All sales final. In our effort to keep shipping costs as low as possible for our customers, invoices for shipping will be sent after purchase is made based upon your request to indicate the USPS service that you prefer. U.S. customers may choose First Class Parcel (if item is under 13 ounces), Parcel Post (which will be substituted for First Class if item exceeeds weight restrictions), 2-3 Day Priority Mail or Express Mail Overnight. If no email is received within 24 hours of purchased you will be invoiced based on the lowest rate available for you. Also, you may simply say "lowest rate available" on your email and we will accomodate accordingly. International Customers will be invoiced automatically at the First Class International rate for any packages under 4 pounds (1.81 kilograms) and at the Global Priority Rate for packages over 4 pounds. If your package is under 4 pounds and you prefer Global Priority shipping, please inform us and we will send you a an invoice reflecting the adjusted rate. For more information on U.S. Postal service rates viist http://www.usps.com .