I just want to add this:
When I really need to eat very cheaply I go to Aldi's. But, for the most part, I'm not impressed with the quality of the items I've purchased there. I try to cook cheaply and healthily for my family, which can be tough!
I find Price Chopper to be MORE expensive than Hy-Vee, but I buy off-brands of almost everything, and Hy-Vee brand and Country Market (a separate Hy-Vee brand) can't be beat for price and quality. Best Choice might be a tad bit cheaper, but I don't like the flavor (referring to canned veggies and fruits specifically).
Hy-Vee also gives you great coupons at the check-out, just make sure you ask for them, sometimes they don't hand them over just because some people don't like all the paper.
Good luck to you!!