I have just found this place called Angelfood Ministries, where you can get a reasonable-sized box of vegetables for $20 (no, it’s not organic, but it is cheaper than a supermarket) once a month. (You can also order more than one box per month). You do need to be able to get there on a Saturday afternoon once a month. They also accept food stamps.
It is “self-select” — you decide if you need their service – they do not reject anyone.
If you are having trouble making ends meet, this might help.