I second what Reef Goddess said - there are many very reputable online retailers and they generally have a better selection than your LFS - this doesn't mean you shouldn't buy from an LFS just that it's another option. As to shipping, stress, etc., when you are buying online you are basically buying from the same people that your LFS is buying from only they buy wholesale - the fish and other animals have gone through lots of stress from ocean to boat to wholesaler to retailer (or you) - if you have the ability to quarantine then you essentially are ok either way. Also, many online retailers have a WYSIWYG section so often you do get to see what you are purchasing in advance...