I had to do this once. I went on a trip to Africa with an organization where I shot tons of photos and HD video. In the end, I had over 100GB total, and they needed my source footage to edit videos and such. I lived in Florida, and the editor lived in Georgia. We tried dropbox, but that just was going to take weeks.
Our plan? He went to Best Buy, got a USB hard drive & mailed it to me. I loaded it up with footage and mailed it back to him. Once he got it, I think he was even able to return the hard drive and get his money back. The only expense was postage, and we saved a lot of time.
I work in the ediscovery industry, we very regularly need to send large collections which can easily be a TB+ to another location on short notice. One of our favorite things to do with new folks is have them hop on a plane with a hard drive, give it to someone at the airport, and get right back on the same plane.
Our plan? He went to Best Buy, got a USB hard drive & mailed it to me. I loaded it up with footage and mailed it back to him. Once he got it, I think he was even able to return the hard drive and get his money back. The only expense was postage, and we saved a lot of time.