Yeah a box/bag of oatmeal would easily be cheaper than that box of cereal, takes three minutes to cook, and would be much healthier than the cereal, even if you need to add a bunch of sugar to it to make it palatable to kids.

This photograph is just a unique situation that seems to occur in industrialised nations with food deserts. Where this kind of food can be made very cheaply, and even the poor have the purchasing power to afford it. These kind of ready made meals and snacks are usually very expensive in South Africa (except for the ramen/two minute noodles, those are always cheap). No way would a poor person here buy some microwave pizza over a bag of rice or pap.