Shredded lettuce in a tupperware is my staple for lunch...then whatever leftovers or prepared stuff in the frige at home...tuna salad, egg salad, lunch meat, blue cheese, etc.

Also, I like to bring some sliced cucumbers or zucchini with some spinach dip for snack...not prepared at the grocery store, but if you eat out every day, stick with the deli and produce section... most of their prepared salads and stuff have sugar or some other carby sauce in them.

My Albertson's has a small take-out of BBQ hot wings for $3. which are good in a pinch. Eat some salad with it, and it's a meal.