I have a local grocery store that has a salad bar and I go there a few times a week to get a salad, and I don't make it so big so most days it costs me like 3-4 bucks to get a salad that fills me for lunch. I don't know how much it is at whole foods but 3-4 bucks seems reasonable to me?
My trick: stick with the baby shrimp for protein instead of the chicken. A little bit of shrimp satisfies me more than an equal amount (in ounces) of chicken..