Well, just to tell you...
You need to put them in heavy bags, with lots of air. They need to be well packed, not flopping around. Put the pags and some kind of insulation in a big styrofoam tub type thing. Then put that in a box, and put LIVE FISH all over it.
That is what most online retailers do. Any other suggestions?
If you don't love what you do, you'd better find something else to love. Otherwise, you don't have a reason for living.