Hi Rysmom!
You'll get oodles of good suggestions here. I have one stand by that works when I have only a few minutes and zero inspiration in the kitchen. It's based on having a Trader Joe's close by, but you could probably work it out if you don't... anyway:
I buy cooked brown rice in a plastic pouch (60 sedconds in the microwave!), a can of spicy black beans, some fresh salsa, and grill a chicken breast with some mexican spices. Shred the chicken breast and throw part of it in with some beans, rice and salsa. It's healthy, filling, cheap (bonus!) and works out to about 3 lunches.
Just a thought...
Good luck!
cheers!
paula