Extra cost of items for DS2 who is lactose intolerant.

DD & DS1 have normal cows milk $1 per litre - DS2 Lactose free milk $2.15 per litre

DD & DS1 normal kids yogurt $4.60 for 12 pack - DS2 Lactose free yogurt $3.60 for 2 pack

With so many kids with intolerances and allergies, you would think food manufacturers would give you options on the standard products and charge the same or only slightly more.