Hack a healthy, yet not expensive, meal.
SarahToton: CHEAP TRICK: Buy staple foods that'll keep. Pasta, canned tuna, canned veggies, tomatoes, beans and rice rarely go bad. For good cheap protein, try preparing eggs (not only scrambled or hard-boiled, but use them in egg salads, green salads or in pasta recipes.) Also, check out: http://www.getrichslowly.org/blog/2007/07/30/16-ways-to-eat-....CHEAP DINNER: Because I have no patience and often forget to eat, I've figured out a cheap, filling lasagna-type1) Prepare favorite pasta (penne works well)
2)Heat some marinara sauce, can or jar is fine.
3)Once the sauce starts to boil, reduce heat and add 1/2 C to 3/4 C cottage cheese to sauce  (works like ricotta). 
4)If you prefer, spoon cottage cheese over hot pasta and cover with heated marinara, then microwave or bake briefly to warm cheese. This adds a nice layer of melty cheese.(Cover plate of pasta, cheese and marinara with shredded mozzarella and bake at 425 for 9-12 min. if you want to be fancy and cheap.)