Other good sources for live rock (I have not used)
Aquacultured live rock is one of our specialties. You will get one of the best live rock available in the industry. Forget about painted rock with no life.
www.kpaquatics.com
Gulf Live Rock Specializing in wholesale and retail sales of Aquacultured Live Rock and live sand at direct from the diver prices. Free Shipping! coral reeftank
gulfliverock.com
We offer absolute best live rock available anywhere, Direct from the diver! for the same price the pet stores pay for live rock. Shipping included in many packages.
www.liverocknreef.com
I was lucky my LFS imports real Pacific Ocean live rock. As mentioned, there are several LFS that sell live rock that is mostly just dry rock soaking in a vat. This rock is cycled and will give you a cycled tank, but carries near zero of that wonderful ocean diversity. There is nothing that will give your tank the biodiversity of real ocean live rock. Since your rock is your main filter and the backbone of the system, I would recommend anyone get the highest quality live rock they could afford.
What is this diversity I speak of? Diversity of bacteria and microbiology is the strongest component. This determines the strength of your biological filter. The diversity of life in live rock will help you cover many niches in your system from tiny critters forming your clean up crew to macroalgae that absorb nutrients and feed your livestock.
While you may get some undesirable creatures, all are manageable and removable. I recommend curing any rock outside of the tank to let it mature and also, to look for and easily remove the unwanted hitchhikers. Good luck and remember all of us have been there and are here to help. Even those of us doing this forever forget not to panic sometimes.