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Mushrooms do not fruit from grain spawn. Instead, grain spawn is used to inoculate a fruiting substrate.
Blue Oyster (Pleurotus ostreatus columbinus) rye grain spawn. This is made as a custom order and is available by the kilogram.
You can use Blue Oyster to inoculate:
Blue Oyster can fruit from grow blocks (sawdust only or sawdust supplemented with bran) indoors or on log stacks outdoors.
Blue oyster is known for creating many pins and a higher than normal requirement for fresh air.
Species overview in our library: https://www.fungiakuafo.com/library/species-blue-oyster-pleurotus-ostreatus-columinus/