Originally Posted by Scifience

Check into Yamato Transport USA, the US division of the ubiquitous "black cat" delivery service in Japan. Depending on the dimensions, it looks like a 5kg box would cost $55 for delivery in about one week. I've used them several times for US->Japan shipments and have no complaints.

http://www.yamatoamerica.com/en/send/send_taqbin.aspx