In short CSA stands for Community Supported Agriculture and you do just that when your subscribe to one. A CSA consists of a community of individuals who pledge support to local farmers or products directly from the producer; usually consisting of a system of weekly delivery or pick-up of vegetables and fruit, in a vegetable box scheme, and sometimes includes dairy products, coffee, bread and meats.
Local CSA Programs
There is a CSA right for you, check out these websites to find your perfect match (keys to look for- size of the box, drop off points, contents of the box, organic or non-organic, farm, etc.). i f I missed any please comment and I will add them to the list.
Be Wise Ranch
Garden of Eden Organics
Tierra Miguel Foundation Farm
Speaciality Produce (not really a CSA but more of a Farmers Market Basket and loads of fun)
Half the battle of using your CSA produce is know what everything is. I recommend
Fresh Produce Guide: The best-ever guide to 300 varieties of fruit and vegetables; published by Try-Food International in 2009.