Jambalaya can be pretty cheap to make and rather filling. I make mine with less Cajun spice than the recipe states so my kids will be able to enjoy it too. I would also suggest peanut butter and jelly. I use cookie cutters to cut the sandwiches in fun shapes for the kids. Scrambled eggs/omelets can be a high protein cheap meal if you can find eggs for a good price. Good luck mama. I hope you make it through this rough time.