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http://www.inlandaquatics.com/ and http://www.ipsf.com/ are the only two I can think of. I have not ordered from either of them so I can't give a recommendation. Seems kind of expensive when you can make your own from good quality LR.
Yeah they do seem expensive i didnt think it would be that much heh. Well i think the way i am switching out my CC for sand will be ok, i am taking half of the CC out and then filling the empty have with oolitic sand, then i will leave it alone for a few weeks and hopefully have some number of my current sunstrate critters migrate over, then when i have all the sand in im going to get some more live rock anyway