Seriously, learn to make bread. Or at least bread dough. We eat a lot of sandwiches when finances are tight, but bread dough can be used for so many other things as well.
I have made bread for years. So long in fact, that I don't use a recipe at all anymore. So I'm going to point you to a blog that I fell in love with several years ago called "Chickens In The Road". You can find the recipe for what is called Grandmother Bread HERE. If if you don't want to make a loaf of homemade bread, learning to make the dough will be valuable skill in keeping budget friendly eating from becoming boring.
You can make rolls, pizza, doughnuts, fry bread, pita. The list goes on and on. You can also freeze bread dough. Let it go through the first rise. Then shape it into whatever you want it to be and pop it in the freezer. How about making homemade cinnamon rolls. Keep some in the freezer ready to go. Just pull them out the night before and bake them in the morning.
Roll the dough flat, put in whatever leftover meat you have in the fridge, add some cheese and maybe some chopped onion. Roll it up and bake it in a 350F oven for about 45 minutes. This is one of our family favorites. Let it cool about 15 minutes and slice it up. The kids love it when they can eat dinner with their hands. Sometimes I put sauce in it. Sometimes we have sauce for dipping, or homemade ranch. My son will dip almost anything in ranch.
Don't be afraid to experiment. It's pretty hard to mess up bread. Even if it doesn't look pretty, it almost always tastes divine.