Are you near Fresno? If so, you can always get a free meal over at the Poverello house. You can also get a food bag. https://poverellohouse.org/what-we-do/food/emergency-food-bags
I used to volunteer over there. Great place.
As far as prices go, you can get a big 25 pound of rice/beans for less than 20$ over at Winco. Back when covid happened it lasted my wife and I about a year on both. It gets boring, but it works.