This is the real problem with dollar stores, or low-price brands, it's not about quality of the products but IMAGINATION.
We have been educated by media that only those renowned brands that are advertised massively are good, and the publicity "genius" bombard us with commercials narrating how good is a food that may cost more but "quality is what really matters."
Sometimes those popularly known, advertised products may be good quality, but not necessarily, as those from dollar stores are necessarily bad.
In most countries/states/cities there are regulatory authorities that verify products sold in stores regardless their range price. If those from dollar stores would be as worst as people imagine, those authorities would already taken off the market.
Now, this does not mean that the products in your dollar store are the best, depending on the store chains, quality and taste of those products vary, and you can always try some to see if their quality meet you taste and nutritional requirements