STERILE GRAIN 2 bags w/injection port for $30 4 - 4.5 lbs of sterilized mixed grain (70% Wildbird seed (no sunflower), 20% Rye berries, 7-8% vermiculite, 2-3% gypsum). Supplemented with gypsum and vermiculite to balance water content, pH and to facilitate breaking/mixing. DRY SUBSTRATE MIXES Dry/processed horse manure. Harvested fresh and promptly dried. I have plenty of pre mixed blends for sale online, horse manure / coco coir blends, 50/50, 33/66, complete with gypsum and turkey bags for at home pasteurization. I can do $15 for a bucket (bring your own 5 gal), of a 1:2 (manure:coco) dry blend. Minimum 2 buckets. Pasteurization kit, $25. This includes 5 gal of a 1:2 (manure:coco) dry blend, two nylon turkey bags, 1 liter of powdered gypsum. Final concentration of gypsum (by volume) is 5%. Fill the turkey bags with substrate, water, and cook/pasteurize in the oven or a steamer. Minimum 2 kits