Here's a link to a blog post from a couple who's lived off the grid for 22 years.

It's somewhere at the headwaters of the Buffalo National River, in the Ozarks -- pretty rugged country. But the road network is good. May be out in the boonies, but I'm sure it's pretty easy to get to.

The website where the blog is posted is the Ozark Natural Science Center, where fifth-grade students spend two days a night learning out door science. ONSC also offers/hosts a variety of classes including an outdoor survival institute.