Coastal Brand Calcium & Poultry Shell, 50 lbs. by Coastal Brand $14.99 variants 50lb - $14.99 Size 50lb Quantity This product is available in-store only. Obtain optimum eggshell quality with Coastal Brand Poultry Shell. This special blend features calcium carbonate to help grow healthy eggshells and strong bones. Simply apply to poultry feed rations for best results.