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http://reefrocks.net/
2$ a pound but its dead rock but its a great site I have 3-4 rocks in my tank that weigh 6-8 pounds very cheap and give you all sorts of shapes and sizes
Where are you located? Most of my LFS sell for $6-9 lb, but I see it listed on Craigslist for half that. If that is not an option, I would buy regular "dead" rock and then try to get a couple pieces of rubble with coralline. That will eventually spread. My LFS sells small pieces (golf ball sized ) that break off their big stuff for $1 each. $12 is ridiculous.