I love My Nana's brand corn tortilla chips. About ten or so years ago I went into a grocery store that had some by the deli in a clear bag. Rather than the white paper bags found in the chips and snacks aisle. I think they were cheaper than normal and the thought of them being made relatively fresh on site was enough temptation. (You actually can buy fresh tortillas at some stores here, like Food City and some ranch markets, but it kinda depends on location).

My Nana's also sells uncooked flour tortillas too. Presumably they also distribute corn tortilla chip bases to stores for use in the deli. As these were in fact fried on location. In the donut fryer oil. They were actually kind enough to put that in the ingredients. Only in the ingredients. There was nothing else on the packaging to hint that you're going to get an oddly sweet undertone when eating chips and salsa later that night.

I should say that My Nana's does also sell flour bunuelos in the bakery section. And these chips would make a good corn base for something similar. However these were not marketed as bunuelos or even adjacent. I'm guessing it was just this store being complacent and covering their asses when they printed the labels.

This was a Bashas btw. A store only Arizonan's know. Couldn't say if it was common at other stores.