We've been buying Marie Callender and Boston Market meals lately.  $2.50 each and between 380 and 660 calories.  Throw them in the microwave for 5 to 7 minutes and they're ready to eat as well as good.  Not home cooking but tasty, quick and inexpensive with no cleanup.

I ignore the instructions that say cook X amount and the take out and stir.  I've found lop off about 1/2 a minute from the combined times listed and they turn out just fine.

We also buy mixed frozen vegetables and cook them in the microwave in a large bowl which we keep in the fridge, then add some to each meal for dietary concerns.