Best bet is probably marco rock, again, not sure if lfs carries them... I've seen one the size of 4 basketballs. Not sure if it was epoxy together, but if it was, I wasn't able to tell because the "look" of all their rock is pretty consistent.
I have a large cave rock that we did not use when we redid our reef tank. It's probably like 2 basketballs. We bleached it & it has been dry for 6 months. If interested pm me with your cell number & I'll text you a picture.
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