The best lunch you can buy for $1.25!
I am really into Campbell's Select Healthy Request soups. It's cheap, it's relatively healthy (note my "healthy request" and "low sodium" choice) and it is very filling.
I usually go with the savory chicken and long grain rice, but the mexican tortilla soup is another fave. With some crushed up tortilla chips and a little cheese - it is a fiesta of flavor.