All / Grains & Substrates All Grow Kits Fresh Mushrooms Grains & Substrates Supplies Shiitake Grain Spawn - 3 lbs $19.99 Add To Cart Blue Oyster Grain Spawn - 3 lbs $18.99 Add To Cart Lion's Mane Grain Spawn - 3 lbs $19.99 Add To Cart Organic Rye Berries Pressure Sterilized - 3 lbs $14.99 Add To Cart