Community Supported Agriculture

So for a while now I've been wanting to 'clean up' our diet....eat organic most importantly. For a few summers I've thought it would be nice to buy a share in a farm co-op. If you don't know what CSA is, here's a summary. Basically there are tons of local organic farms that participate in CSA. People buy a share of the farm at the beginning of the season, and then each week you get a huge box of their fresh veggies and fruit. Most seasons are 20 weeks long, but some farms even have year long programs (I assume they have greenhouses?). You can either pick up your box at the farm or they deliver to centrally located pick up sites. The cost for an average 20 week season is anywhere from $300-600 depending on the size box you get. Most farms are growing over 40 types of produce so you get a huge selection! Fresh, organic veggies. How great is that? I know it sounds like a lot of money but if you divide $500 by 20 weeks it breaks down to $25/wk which really isn't bad. It's even cheaper if you split a box with a friend. I might do just that with my mom if she decides she wants to go forward with it.
Here's a link with the farms that do this:
http://www.landstewardshipproject.org/csa.html#big_river