Where I live in Europe, soy products such as tofu are more expensive than chicken meat. The same for quinoa. Here the only protein sources that are cheaper tha

Where I live in Europe, soy products such as tofu are more expensive than chicken meat. The same for quinoa. Here the only protein sources that are cheaper than chicken meat or whey protein concentrate or milk protein concentrate (per their protein content) are wheat flour, lentils, chickpeas, beans and some forms of oats. Dry peas are also cheap, but they are seldom encountered, because most people eat only green peas, which are quite expensive per their protein content.