For smaller dimensional items; Shipping via "JP Small Pack Post" is one of the most economical and reliable shipping possible.
The "Small Packet" Parcel Post service is extremely reliable to USA, Australia, New Zealand, Korea and many other countries. More than 90% of those Parcel Post shipments arrive in seven days or less, with many of those taking four to five days. About 10% take seven to fifteen days to arrive, and less than one percent take twelve to twenty-five days in total.