It doesn't really matter where you get your live rock online. You should always cure it. I know some sites claim to sell fully cured live rock but there will be die off in transit. IMHO unless you get your rock locally and can pick it up, cure it. You can do it just by putting it in a clean (new) trash can. Plop in a couple of PH and a heater. Keep tabs on the perameters for a couple of weeks or so. When they get to acceptable levels, your golden. You won't be sorry.