hmmm, free shipping....that makes me wary. IMO
the guys at www.liverocks.com
do an excellent job...primarily in shipping the rock to you in under 24 hours time. I got my LR
from them, and never saw an ammonia or nitrIte spike.
They use DHL for overnight shipping...who prices competitively against FedEx, so it's a prety decent price per pound of live rock, even after shipping. It was cheaper than going local, and better quality.
Inquire about their shipping policy. You may end up with LR
that needs to be cured first...which is not a huge deal in a brand new tank that doesn't have fish/inverts in it yet.