We just had a discussion on Google+ about eating on a budget. Seems I need to write that book afterall. One of the strategies I've always employed is food subsidies. That just means that a cheap food subsidizes an expensive one. Restaurants do this all the time, that's why you have starches (potatoes, rice, bread) with your meats. The price of a starch is a fraction of the price of herbs, spices, aged cheese, wine and meats. Next on the ladder is most vegetables. It's a rare occasion for vegetables to cost more than $1 per lb. When was the last time you bought meat for $1/lb?
So with that in mind I'd like to focus on breads. Now if you buy the budget American white bread you may be able to get it for a dollar for a 24 oz loaf. You can make it cheaper but it's really the yeast that costs so you have to commit to buying a block of yeast to make it worth the trouble. Then there's the rising time etc.. Usually these hurdles are too much and people avoid saving money by buying bread and understandably so. However, flatbread can be easy to make and dirt cheap. Pita usually costs about $3 in the store for 10 ounces. That's a starch for the price of a meat.