There are sometimes REAL 6 egg cartons like yours, often they just cut them in half at the store to make a 6 pack. Also common are cartons for 18. And at places like Costco you can by cases that have "flats" that I THINK hold 30 each, not sure how many flats in a box. I've never bought those. I think you would pretty much need to be running a cooking/baking business to buy them.