looking for base rock?

[Whaledriver]

I am looking for light weight base rock that is mined somewhere in Florida. I live in Illinois and want to buy a full pallet of some. I have found some porous and light weight rock but it is about the same price as live rock when you figure in shipping. I could make a lot of people around here happy if I could find this.

Does anyone know where I could find something like this?
Thanks for your help!!