Very simply, you give a "company" (company, in the sense that they are neither farmers nor sellers nor delivery people) somewhere around $600 in the beginning of May, and every week or two, for five or six months, you get a crate of just-picked veggies fresh off the farm, delivered to your door. Well, maybe not your door--these companies have drop-off points. Some even do eggs. And odds are you never know what you're going to get until you open the box.
These farms are local, and most of them are organic. The eggs are probably from cage-free hens. That sort of thing. Suffice it to say that the amount of money spent is works out to the system being less expensive than shopping at Whole Foods.
The link is www.farmtocity.org