I got a 13' upright on CL for $100. It was ten years old when I got it. Still works after a few years. if you have a family you'll like how you can buy other freezable items in bulk and save.
+1 for bigger is better. Fill up some empty water gallon jugs 80% (expands when frozen) and fill up the space. Not only does this make it energy efficient, it will keep your food cold in a power outage.