i live in the apartment complex i contract out to, so i can pretty much do lunch however i want, but usually i just have a power bar of some sort
the met-rx colossal 100 bars are good - i like the peanut butter pretzel, chocolate chip cookie dough, and apple pie ones
snickers protein bars are good
you can buy all of these online way cheaper than buying them piecemeal at stores (like, half the price)
sometimes in winter i make big pots of soup, freeze it in containers, and have a bowl of that along with a light sandwich at lunch for a week or so afterword