I was in a CSA last summer - I split the share with 3 other single women and it worked out pretty well since none of us really wanted to have whole canteloupes or watermelons and we could easily cut those up. Dividing up 3 peaches or tomatoes was a little more annoying but it still worked out really well. Ours worked out to $7/wk/person.
Sadly, the farm says they won't do it for our area next year unless they have 20 participants, that is full shares. They would deliver the produce to their satellite store about 50 miles from the farm. Honestly, if they are shipping produce to the store anyway... why not include the CSA shares? I doubt that I'll get to participate this summer, and so far my research has not identified any other CSAs closer than 40-50 miles from my house and/or work.