Delicate shippers that are injured easy both in shipping and when caught in the ocean. Recommeded shipping is in oversized bags for these animals.
My suggestuion is not to buy one online but buy one from a lfs. Ask them to hold the animal for 2-3 weeks. pay a little extra if you have too.
That fish could die after any online guarantee expires and you are out all the money. THis way, you will probably pay a little less as you do not have to pay shipping...and you can let the lfs get it eating. The time will also allow the animal to heal if it has injuried from shipping, etc.
This is the only way I would even attempt to buy one. Less risky in my opinion.
All this being said, these animals are better off left in the ocean as their track record for survival is not good.