I would first look for someone tearing down a tank locally (sometimes you can get it for $1 / lb this way) and then dry it out myself.
Otherwise I would probably go with the Marco. Looks like it would be a lot more porous than GARF's rock. I do have some of GARF's rock and it is on the dense side.
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150 gal Custom. Born 5/7/07. 50gal, 29gal, 20gal Sumps. 30gal Frag Tank. ETSS 800 Skimmer, Deltec APF600 Skimmer. PFO Solaris Lighting on Display and Frag Tank
My Tank Thread
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