You're very unlikely to get a couple thousand dollars of food over a couple of years out of even a large "box," where the box is approximately the size of a bed

You're very unlikely to get a couple thousand dollars of food over a couple of years out of even a large "box," where the box is approximately the size of a bedroom. This is one of those cases where it's cheaper to simply buy the food from someone who has economies of scale on his side. It costs even less if you cut out the middlemen (supermarkets, distribution, etc) and buy directly from the farmers where possible.