Non organic and GMO foods. Oftentimes the only difference is the label. Even if truly "non GMO" that doesn't count for the thousands of years worth of selective breeding that are basically GMOs with extra steps.

Not to mention for organic and GMO food they often use a shit ton of pesticides because they can't use plants with built in insect resistance.

Another, perhaps controversial, item are non cage free/free range eggs and meat. Similar to the first point, most of these only differ in label and there is often no difference. Even if they are free range and certified by the government, the official definition for free range is a maximum of 5 chickens for a 1x1meter of space, hardly free range. Cage free is even worse, instead of many small cages it's essentially one large cage with thousands of chickens and much greater chance for workers to step on and crush them while attempting to work.

Food should be cheap but a company's soul objective is to increase revenue (high prices) and reduce cost (inhumane conditions). Even farmers markets are corrupted, many of the stands there sell goods from large producers to capitalize on peoples willingness to spend more for "local" and "humanely" produced goods.

That being said if they are genuinely a local farmer doing honest work then please support them. They need all the help they can get.