From my experience it is best to have them send it by the US Postal Service.
I am tempted to have them sent via USPS but I was told that there is no coverage on the bulbs if I go with them. I don't know what their track record is on breakage but I would hate to have $100-$200 worth of T5 shards in a box when it gets to my house. I wish I knew someone in the US that could bring them over the border for me.