I've ordered online and had good success. I did order some mangrove plants that arrived like frozen asparagus but other than that my orderes have all been packed well and included hand warmers to keep everyone alive and well. My favorite coral order came from GARF. I was nervous about what I was going to get because it's kind of a "grab bag" ordering system but everything I got is growing like crazy! Start with some GSP, Riccordia or mushrooms. They're easy. If you get GSP make sure it is on a self contained rock and don't let it get on your main rock stack because it grows like a weed and is difficult to remove from LR once it grabs hold. One thing I've done the past few weeks is to get a bunch of that sea weed stuff the tangs like to eat. I don't have any tangs but my crabs and snails are having a blast. I've got tons of tiny baby snails and my tank seems to be cleaner. In any case, it grows easily and adds a bit of green to my otherwise mostly brown tank. It's cheap and if it dies it's not really an animal like the corals are. Good luck!
Catherine