Ok so I have been going down to the feed store once a week on delivery days to get Oyster shell but every time I go there ins't any. They say they have no idea as to why there is no Oyster shell and what ticks me off more is that if they answered their phones it would save me the half hour drive there. and of course back for nothing. However they are the only place that carry feed up here, the other closest is 1.5 hours away. So I do use crushed eggshells and feed them back to them but I got a soft shelled egg yesterday, so I am thinking their calcium is dropping. They are on layer feed...Any other ideas on what else I can feed them or is there a calcium supplement I can add to their metal waterer??