Here are my top picks for cheap dinners:
Whole fryer chicken (these are always on sale somewhere) roasted and used for many types of dinners: just roasted chicken, chicken & noodles, chicken pot pie, chicken enchiladas or quesedilas, chicken tortilla soup or white chili
Beans: Navy beans & cornbread, canellini with pasta and tomatoes, cowboy beans (pintos), chili with ground beef
Pasta: The best book for recipes is Bugali on Pasta - so much variety and unique recipes
Soups: Roasted tomato (from epicurius.com), roasted red pepper (in season), pasta fagoli, vegetable with beef, butternut squash, chicken tortilla, chicken & noodles, potato & leek (from Patrica Wells cookbook).
We pair a hearty soup with good sourdough bread and this is a complete meal. Some also pair nicely with hard cheeses or grilled cheese sandwiches. Our family favorite is gruyere and cheddar combination with the roasted tomato or red pepper soup.