King Ed's has cheap live rock, but they dont take the best care of it. You have to watch when the shipments are coming in and cure it yourself in your tank... that way you get the most life off it. I've lucked out and gotten live rock from them that is absolutely amazing- Jakarta. Fully cured and had tons of stuff growing off it, and was only $5 a pound!
Its best to check all the stores.
-Diana