I do a lot with ground turkey, burgers, tacos, sloppy joes, etc., although it's not the cheapest. There's a interesting thread in the Diet & Nutrition section with an article link about using regular ground beef and really, really rinsing and draining it getting rid of some fat, and that is cheap, so you may want to check that out.
You can get turkey or chicken sausages/bratwursts. Breakfast for dinner is also a really inexpensive (depending onthe meat you get, if you get meat), easy option. Salad with lunch meat or the pre-cooked bag chicken is something we have once a week or so as well. You could also do a chicken or some chili/soup in the crockpot. Stick it in in the morning, dinner's ready when you are!