It's still expensive. Don't kid yourself. Even dry base rock. It's the same for all of us and the worst part is that's mined right here in Florida. The quarries don't sell small quantities so.... The Garden centers sell Florida field rock with shells encrusted on it as landscaping stone. I have a pile of it out back and I'm gonna hose it and soak it in Chlorine for a few days. Would love to see if its Reef safe. I'm sure testing for phosphates will be primary concern. It's no where near as porous as the stuff we buy for the tanks but I'd love to know if it's usable. And that stuff is cheap.