I came across this today via Not Martha. It's a Yarn CSA, the first of its kind (Not Martha is actually giving away a share). Martha's Vineyard Fiber Farm is the source of this CSA, and they raise registered Angora Goats, Cormo, Cotswold and Babydoll Southdown sheep, resulting in wonderful fleece that can be turned into fiber. Here's a little more info from the site:

Our farm is dedicated to producing the finest fleeces, roving and yarn by giving our animals the best possible care. We are deeply committed to raising our goats, sheep on a natural diet of pasture and hay for as much of the year as possible. We’ve also made a conscious decision to have our fleeces processed by a small, family-owned, solar-powered mill rather than sending them to a big commercial processor. We think the extra attention detail we receive is worth the added expense and slightly longer return time. And we like the idea of keeping those dollars in the hands of fellow farmers.

When you purchase a share in our CSA (stands for Community Supported Agriculture) you are investing in our Spring 2008 “yarn harvest”. You’ll receive an shareholders certificate, weekly email updates on what’s going on around the farm and an invitation to our Shearing Day Celebration.

The money we receive from the shareholders will be used to purchase hay and feed for the animals and to increase the size of our flock. We will be adding 10 more nanny goats and two additional cormo ewes this year, and we are taking a serious look at a couple of alpaca. Every animal we add will increase the size of the clip and amount of yarn shareholders will receive.

After shearing, we’ll let our friends at the mill work their magic and soon you’ll receive your share of the harvest. The number of skeins, yardage, etc., will depend on the size of the clip but we are limiting our shareholders this first year to ensure that everyone gets a bountiful supply. You can choose to take all of your share in one kind of yarn or receive a sampler with some of each of the yarns we produce, including mohair, kid mohair, Cormo and Cotswold. Just type "one yarn" or "sampler" in the "Buyers Message to Seller" box when you check out. We also have Spinner's shares available- both roving and raw fleece.
We’ve priced our CSA at $100 per share. Of course, you’re welcome to buy as many shares as you like (while they last!) and a Yarn CSA share makes a great gift for all the knitters and crocheters in your life.

You can purchase this Yarn Share via Martha's Vineyard Fiber Farm's Etsy shop.  Please not that this CSA is not affiliated with the Hellgate CSA.