I hear you, Mof4! We used to be able to buy chicken breast or even a whole chicken. We now buy chicken thighs with the skin and the bones as even skinless, boneless chicken thighs has increased in price. We no longer buy pork, except bacon and sausage.
On your second point, the poor get fat because they also buy large quantities of junky, highly-processed foods. Some of that is because it is cheap! The other part is the lack of nutritional education. I don't know where you live, but here, they have eliminated a lot of programs like home economics.