My father-in-law owns a carwash business. I want to take advantage of the foot traffic by selling sandwiches using frozen cured meats like cooked ham. How much nowadays are simple ham and cheese sandwich at your kid's school or your office cafeteria? What other quick snacks can you suggest I offer?

Why not pair your tasty sandwiches with drinks? Maybe you can also prepare homemade lemonade or iced tea or simply purchase packed juices in supermarket wholesale secs and sell them in the same location you're eyeing. Apart from that you can add some chips and or biscuits and candies. You play it by ear. You check also what do think people usually look for as they make "tambay" while waiting for the service they needed gets done.