It's not ideal, but its possible. I have not done it, but I know that people have shipped gravid females and still gotten healthy eggs. Once they are gravid, there isn't a risk of reabsorbtion, so I would suggest packing them as carefully as possible in insulated containers, and maintaining temps well as possible. Heat packs would probably be fine. Again, I've never tried it but that's what I would do if I had to.