Looking for a good Meal Replacement Bar for Lunch.

Any good suggestions? I'm looking for something to have as a lunch with maybe a piece of fruit or veggie- something low cal as my big meal tends to be dinner with the family at night. I'm in Canada so what we have available may be different from you US (and elsewhere) folks. I like to have something fast at work and then go off for a walk to do errands as I only have 30 min lunches.