In this neck of the woods, at least, Target is cheapest on most products. And believe me, when I was going through diapers 2 cases at a clip....I knew prices everywhere to the penny. :-)
I buy nearly all dry goods at Target, and some groceries, as well. Selection isn't nearly as good as the grocery store, but if they have what I want, why not?
Add that to the fact that I'm on their mailing list and they send me coupons (that I use, mostly) every couple of weeks, and I save a bundle.
I don't work for them, or own their stock, or anything. Just sayin' that they might be worth a look for you....
Oh, Target only beats Walmart on sales or niche products. On the dog food, they are more expensive on the same size bag for adult dogs, but only Target has the 20# bag for puppy food, so they get my purchase. But on my staples, Walmart beats them consistently on day to day prices.