You can get 30 pounds of florida, aquacultured rock for $133 shipped to your door from
http://www.gulf-view.com
You also could get fiji rock wholesale from
http://www.eastcoastclams.com/ $2.25 a pound in a 40-50lb box. This is shipped air freight, and you would have to pick it up at your local airport. Depending on your location, shipping ranges from $.25-$.60 a lb. These are the best places I've found for live rock on the internet.
Your best bet, though, is to be patient and find a local reefer breaking down his tank. I picked up 70 lbs of live rock, 2 clownfish, a sixline wrasse, a yellow watchmen goby, a couple leather corals, a cup coral, and esv b-ionic supplements for $50. I had to drive an hour for it all, but it was well worth it. I previously picked up 35 lbs of live rock for $50 from another reefer. All together, less than a dollar a pound. See if there are any local reef clubs or post a message to reef central's forums. That's where I found out about my purchases. Cheers!