Yeah... I'd like to know about any live rock that is considered "prime" by anyone for 2.99 a lb. 6 bucks for good rock is a pretty good deal.... if it's good. If you are patient, you will find a local Reef Central member will break down a tank and sell off live rock that has tons of growth, hitch hikers, corals, polyps, coraline, etc... for 3 to 5 bucks a lb. I think I see this happen at least once every 3 months or so. Long story short, local fish stores generally have rock shipped in. This rock normally has a certain amount of "die off." Buying nice rock with a bunch of growth from a local RC member and quickly acclimating it to your tank will ensure good healthy rock as opposed to taking a chance on spiking your amonia, nitrates, etc...