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Mushrooms do not fruit from grain spawn. Instead, grain spawn is used to inoculate a fruiting substrate.
Pearl Oyster (Pleurotus ostreatus) rye grain spawn. This is made as a custom order and is available by the kilogram.
You can use Pearl Oyster to inoculate:
Pearl Oyster can fruit from grow blocks (sawdust only or sawdust supplemented with grain) indoors or on log stacks outdoors.
Species overview in our library: https://www.fungiakuafo.com/library/species-pearl-oyster-pleurotus-ostreatus/