Check into something called MBAGS at your US Postal Service office.
The USPS (not UPS) has actually made it alot easier to ship things by mail overseas, or by large weight and parcel now.
The cost for shipping can actually be LOWER than it is to send normal priority mail or parcel priority mail.
The reason for this is the Postal Service's new program is designed to help anyone with a business. Such as a shipping business etc., it is designed to ease the rate of transfer for shipping rates or shipping internationally.
Additionally there are also services such as EMS in China, & elsewhere which do freight. Pickup or import/export can be expensive though. So always be sure to go to the Postal center and get questions answered first.
Check into your local Post Office for more information and always specify what the minimum weight is. Then they can normally tell you direct, what the rate will likely be and how best you would want to ship that item.