It depends on what you define as healthy foods and health generally. I mean frozen stuff is even expensive but I do frozen fruits and will buy in bulk if I can find it, cost co is good for that. Target also has some surprisingly good frozen section.
It's also if you want organic vs non organic but that's mostly a scam. You should look up chemophobia if that's the case, there's a good book on it by a chemist that tries to distill food myths.
We also got a trader Joe's and you can make 4 or 5 ingredient meals with that store too. There's an instagram by an author who lists all kinds of recipes under 5 ingredients or less with tons of ideas.
But when i ask what you define as healthy, for some oats are the devil and for others, not. I like meat still but can also do mock meats, tofu, beans, most legumes stuff like that.