I use the Region A boxes with USPS when I sell these drives on Ebay. I had to order the Region A boxes through the mail and it took forever for them to deliver, but they are close to the size of a medium flat rate box and only cost $7-$9 to ship! Only problem is that I have only been able to ship them through Ebay and no one local to me carries the boxes so they are a pain in the butt to get...