Other savings in the kitchen can be had by reusing plastic bags and aluminum foil. You probably don’t want to do this if they have been used to store raw meat, but often they can be used many times before discarding. When I was growing up, my dad rigged up a string over the kitchen sink with a clothes pin attached to it. Plastic bags were washed and rinsed and then were clipped to the clothes pin to dry. Now I do the same thing. Freezer bags, particularly, are expensive but sturdy, and will hold up to several washings.
Those plastic bags that you bring your groceries home in also have multiple uses. They can be used to line trash cans instead of buying separate bags for that purpose. Dog owners find them convenient for cleaning up after their dogs while out walking. Many stores recycle them now which is handy. Of course, the best option would be to take your own cloth bags to the store and reuse them, thus avoiding plastic altogether.