I can't speak to the cob-home question, but regarding land...Virginia is super-diverse in terms of culture, community, economics,
politics, ecology, etc. With that diversity comes cost variations and options for meeting your desired lifestyle. Eastern Shore, Hampton Roads, RVA, C-ville, NORVA, western VA ala
Joel Salatin. Lots of options!
You mention
community, by that do you mean communal living, or proximity to cultural centers? If you are thinking the former, check out Twin Oaks for reference.
https://m.facebook.com/TwinOaksCommunity/
And if you want to go further west and are curious about the culture from friendly permies, try these folks:
https://www.facebook.com/shenpermaculture/
Regardless, I recommend spending a good deal of time researching options on websites like www.landwatch.com, and then if you decide to look into the greater Charlottesville area, I personally recommend reaching out to this realtor...super friendly.
https://www.facebook.com/Virginia.Homes.Farms.Land/#