Using staples like flour and dry beans instead of prepackaged mixes will save you a lot too. Pancakes, biscuits, bread and quick breads are surprisingly simple to make and the raw materials are cheap.
Pressure cookers are money savers also, so if you have one get it out.
Beans cook fast in a pressure cooker and chili or other bean soups and stews are simple in either a pressure cooker or a slow cooker.
Along with tough cuts being tenderized by it you will find the tough meats have more flavour in them than the tender cuts.

Rice is a deal similar to barley, buy it in big bags to save.

Judicious use of a large freezer can be an economy measure depending on where you are. My parents used to buy beef a side at a time and cut, wrap and freeze it themselves.
Even if you can not handle beef a side at a time, many cuts of beef can still be had cheaper by buying primal cuts and breaking them down at home.


There are a lot of unfashionable vegetables. Turnips for example.
Those large swede rutabagas are usually fairly inexpensive, but are very good when boiled and mashed.

Another thing to look into is if there are any local food co-ops. Sometimes they can be very good.
Be careful about package meat deals or boutique producers though.