This app was mentioned in 2 comments, with an average of 3.50 upvotes
I use the Favado app that does just that. You can search for a certain food/item, and get price comparisons from all local stores of your choosing. It also provides the stores' weekly flyers.
iOS: https://itunes.apple.com/us/app/favado/id703787093
Android: https://play.google.com/store/apps/details?id=com.savings.android.grocery
Favado on Google and App Store is probably your best bet.
after getting the food http://myfridgefood.com/ & https://www.supercook.com/ comes to mind.
What you're looking for is sub-par at best cause consumers are lazy and don't add to applications like they should.
​