I have ordered things from several sites online and never had any issues. Only thing to be very aware of is delivery time, example if it is 90 degrees out it would be best to get the package inside sooner rather than later.. Look at places like Aquarium Depot, Live Aquaria, Blue Zoo Aquatics.
LiveAquaria all day. Pretty sad when you can get fish online, in better shape, after having them shipped across the country than what you find down the street at your LFS.