Here's an easy way to save money and cut down on wasteful packaging. Find a store that sells food in bulk and lets you bring your own packaging.
We have several co-ops in nearby counties (soon Company Shops Market will be open in our own county!), but we enjoy stopping at Ellwood Thompson's in Richmond when we go there each month for a kid swap.
They have $0.10 off if you bring your own container, and they take the weight of the container off the item before they weigh it.
Here we have purchased bulk mixed nuts (about a pound), short grain brown rice, liquid laundry detergent, peanut butter (ground in the store!), "neptune's dream" mixed pasta shapes, rolled oats.