How about this one? It's a small EcoVillage in its core establishment phase (though the food production and
land fertility issues have already been taken care of), but the people managing it (and the climate) are awesome, and you can buy shares of it and stay permanently, or buy mini-shares to stay for some time every year, if you're looking for something like that.
www.8thlife.org
Oh, and if you want, you can work (not for free) at building the EcoVillage. Take a look at this:
IntegralPermaCulture.com
I hope it's been helpful