Things like dried beans, lentils, peas, and unprocessed rice/grains in bulk are still relatively cheap on a per meal basis. If you don't have one, invest in a crock pot or insta-pot to make prep easy.
Things like ground turkey (e.g. Shady Brook Farms 85% Lean) is $2.98 for 1.3 pounds at Walmart. A 5 # bag of potatoes is $2.87 and 3# onions $3.48. Add in a couple 12 oz Walmart frozen peas and carrots (@ $0.84 each), and a $0.98 can of Walmart (Great Value) diced tomatoes (28 oz.) along with some Mrs. Dash (when you sauté the ground turkey) and you have a BUNCH of soup to eat/freeze. Total cost is about $9.00 for 4-5 meals AND you will have a bunch of left over potatoes and onions to use for other things.
My point? There are ways to have good tasting, relatively nutritious, high protein, reasonably low (as you want) carbs at low costs.
I make bunches of soups in the winter time, the above is a really quick and easy and tastes surprisingly good. Also cream of potato/onion/bacon, lentil, split pea, etc. etc.
You should keep the 24 pack of Chef Boyardee as backup for (if/when) there is no food available in the stores (i.e. as part of an emergency backup plan), and eat one once in a while (easier to do if you have kids as they think that **** is a treat).