A few places to check out -- all of which appear to be shipping rock as of this moment:
- Tampa Bay Saltwater (aka TBS) - maricultured rock from the Gulf of Mexico
- KP Aquatics - maricultured rock from the GofM
- livestockusa.org - Walt Smith's maricultured rock from Fiji
I used TBS rock (the entire 'package' actually) on a 20g I set up 5 years ago. Incredible diversity as it ships in water ... which also means no curing needed. Too many corals, sponges, crabs, snails, feather dusters, barnacles and other critters to list.
Never used KP Aquatics rock but many folks on the forums have report good things.
Used Walt's Fiji maricultured on the 65g I set up 14 months ago. Ships in wet newspaper, so needs curing (mine cured quick ... in ~8 days) ... and not as much immediate biodiversity. But within about 3 months I was starting to see bi-valves, various tunicates, sponges, encrusting SPS (may be branching ... to soon to tell), zoanthids, and some nice-looking stalks of calcareous algae that I foolish removed before discovering they were a desirable macro rather than invasive ... along with an occasional bubble or two of bubble algae and vertemid or two (all easily handled.).