This probably isn't an earth-shattering revelation to anyone, but if you feel like experimenting, try to buy a week's worth of healthy food for a family on a budget of, say, $50-75. Food manufacturers that target lower-income shoppers with more affordable products tend to include more GMOs and toxic ingredients in their offerings.
Sometimes, it just isn't possible to stick to my usual food restrictions. Generally speaking, I avoid:
Non-organic dairy because of the hormones and antibiotics as well as the GMO feed given to the animals
Non-organic meat because of the hormones and antibiotics as well as the GMO feed given to the animals