If you have a freezer available you can get the bigger than single serve packages and that will save money right there. Cheapest meats are chicken, canned tuna and at this time of year some cuts of pork. Turkey hindquarters can be pretty cheap too. Root veggies and squash are in season right now and should be cheaper. Delicata squash is my personal favorite. Apples and citrus are also in season. You don't say where you are, so I am making an assumption that you are in the US or Europe. If you are in the southern hemisphere it is high summer with lots of seasonal produce. Cabbage and many of the cabbage family are in season. If you need to know how to cook any of them, just ask(I have college age kids of my own and am aware of the level of cooking skills they have).