|This is what it looked like when I opened the lid.|
1 Gallon Milk @ $5.99 - I only used 4.5 cups, so let's round it to $2.
Small cup of yogurt as starter: about $1.50, I think.
Produced: 36 fl oz @ roughly 10c / fl oz.
Organic yogurt in the store costs about 33c / fl oz. That means it can flop twice before it becomes more expensive than to buy the yogurt. I also think it will be much easier to make if I do not have to take pictures all the time!