jsut about all the rocks in my tanks are either from my backyard or the park/creek in back of my house such a good place to find them and i dont complain about the price!
I've got a lot of that Texas Holy Rock, brought it home on an airplane trip after Fencing Nationals and it has worked out great. Its amazing they sell those on Ebay for so much because I've heard its everywhere in Texas, at least all around Austin where I was.