Do you have any info on how long it's going to take your frags to get from there to here? Is it possible to overnight them from there? Obviously speed is a good thing when you're shipping frags.
You can buy little styrofoam containers from places that ship seafood but I've got another idea. Pick up some
insulating foam sheet and cut pieces to build your own insulated container. Pick up a box that's a bit oversized for your frags, cut the foam to fit the inside dimensions, and tape the seams to hold everything together and prevent gaps. Bag your frags and place them in your new insulated box using packing peanuts to take up any extra space and prevent things from bouncing around. One sheet of that foam would make a lot of boxes and at less than $10 even the average hobbyist can afford to do it.
Mike