http://www.waldeneffect.org/blog/Eleven-year-old_homestead_for_sale/
How about a 58 acre homestead that this couple has built up over 11 years, for sale for about $80K?
As they mention, the access is currently limited and being hilly affects the price too. The further out you're willing to go, and the closer to marginal you'll use, the better the price tends to be. But I've seen lots for sale that are remote and raw land on slopes that are still close to $10k/acre, maybe because others have bought nearby and the sellers assume the best? Some of those lots are for sale for 1-2 years as a result.
Access to healthy water is a biggie, not only for a decent well but what is upstream of you or in your watershed. A lot of land I've seen is surrounded by timber company land, so I would expect to be sprayed either directly or by wind drift with broadleaf herbicide that kills anything not named douglas fir.
But then out at Cob Cottage Company, they have protected lands adjacent to tree farms, and the sudden change between the sterile woodlot and their vibrant rainforest is jarring. Song birds and small mammals running around in the diverse forest, and 100 feet into the sterile food desert and it feels like everything is holding its breath, waiting for the Evil Terror to jump out and eat you...
So perhaps a permaculture homestead could survive relatively close to timber land? Or maybe Cobville gets very special treatment? They do have a 1200 year old Cedar which is technically on the timber company land, but the company is afraid to cut it down!