I get mine from J&L, the LFS or sometimes the classified section of the paper. I pay between $1 & $10/pound, depending on my mood. If I see a nice rock at the LFS, I'll pay the 10. The last large batch I bought was ~160lbs for $140.
If I was going to start a new tank and needed rock now, I would order from J&L @ $4.39/lb and have it shipped by bus for $20.
The online and LFS dealers get it from various suppliers in volume.
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Brad
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