If you have shied away from purchasing food from a local dollar store, take another look. While in the past there have been some dubious looking products, the dollar store industry has greatly improved. Often they are selling items that are no longer produced in that size container. For example, when ketchup is produced in smaller containers the current inventory is sold to dollar stores or 99 Cent Only stores. (You have probably noticed that containers and sizes are getting smaller and smaller but sold at the same price).
Note: Some of the stores have fresh produce delivered on certain days. Check with your local stores as to when they have a delivery so that you can purchase low price produce when it is fresh.