I find many of my store brand (Publix) products are as good or better than the leading brands. Not all, but many.

But if you need a specific one, I'd say yellow mustard.

You can still buy pasta for $1/lb at trader joes. It's completely fine.

Depends which store brand too. Costco stuff (Kirkland) is almost always really good. Safeway has a good store brand too (O Organics and Signature). Kroger's are like, okay (Private Selection). Walmart's (Great Value) are hit or miss. Natural Grocer's stuff is usually good, and Trader Joe's is usually great. Target's Good and Gather seems good though I haven't tried many since I rarely go there for groceries. Uh... so I guess I mean pretty much everything.

Food city branded fig newtons are better than brand name. Lol

There's a lot of them. I find it easier to classify by the store. For example, Costco's and HEB's (in Texas) store brand products are considered great (and sometimes even better) than their branded counterparts.

Publix Monterey Jack cheese is, oddly, better than the other brands. Like it's the first one I ever tasted that wasn't just rubbery nonsense. Their milk and butter we like, and their coffee is good.

Whole Foods store brands are all pretty good stuff.

I buy any brand of canned beans (I don't buy refried beans, I refry them) or dry beans, unbleached white flour, egg noodles, fizzy water (though I do prefer Topo Chico, it's a weak preference), sugar, and a lot of what we buy is fresh fruit & vegetables, they mostly aren't branded.

Everything but eyedrops

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.