I keep hearing about farmer's markets being better than supermarkets, and it simply isn't true.
Is your "supermarket" some low-end discount place that caters exclusively to the poor? There is one place that that near me. I never shop there. There are indications: They don't offer bags or they charge you for them, and they won't help you out to your car. Cans are dented. They sell junk food and soul food, but not a full selection of fruits and vegatables. The store has signs that offer to send money to other countries. Uh, to mention an awkward issue, the shoppers are more likely to be obese and black.
The place I go to will always ask if I want paper or plastic, and always ask if I want help getting my stuff to the car. The place I shop at offers minimally processed meat. They sell USA-grown rabbit. They sell tomatos on the vine. They sell bags of super-ripe indoor-grown tomatos. They stock goose, star fruit, at least a half dozen kind of pears including Asian pears, shiitake mushrooms, a full selection of organic stuff, etc. You can get non-rotting fresh fish, or you can get minimally-processed (no phosphates or carbon monoxide or colorings) frozen fish. You can get live lobsters and shellfish. You can get European-style Mars bars, both Marmite and Vegemite, german pasta (spaetzle), german bread (rye), and French jam/jelly. You can get tortillas with just 5 ingredients, all simple and natural, or you can get ones loaded with omega-3 fatty acids and fiber.
The differences are like night and day. If your supermarket sucks, find a better one. Look for a wealthy suburban zip code and go there.