A.H.
I've participated for about a year and a half. I have a large family (5 children), so I buy 2 baskets per cycle. No volunteering is required, though they love volunteers. Anyone who does pitch in gets extra produce at the end of the distribution. The baskets cost $17 for the first time you buy and $15 each time after that. That is because they have to buy distribution baskets for each participant. Every basket is estimated to be $50-60 worth of produce. It is mostly staple items, like carrot, broccoli, potatoes, etc.
There are extra add-ons, like locally baked bread and locally made cheese. Sometimes there's bulk offers, like apples or tomatoes. Sometimes there are spice, herb, or tea offers. All of the offers are great prices.