I've had a few clients get paid to take oyster and scallop shells by the tonne, from seafood processors.

The costs are electricity for hammer milling, and bureaucracy. The bureaucracy is insanely expensive.

If you have the space to store it, find out who takes away the shells from seafood plants in your state, and see if you can pay them for a truck load delivered.

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That's a nice thought, but the only local mariculture is a co-op of mom & pop oyster farmers. They sell it all in-shell to avoid processing costs. I have no need for that kind of scale anyway. I'm just trying to raise my flock of 13 a little more sustainably.