Cho Global (Korean) Natural Farming Chickens
Here are some links that you may find helpful. Using the Korean Natural Farming method for chickens is a great way to minimize feed costs.
The first link is to an excellent Hawaii-specific book that outlines in detail an excellent chicken set up, but is still wholly applicable for use in Southern Oregon.
Putting in forage crops such as purslane, and borage, is also key in keeping costs down.
Here's some great info from Kalapana Organics:
And here is an excellent video outling the Korean Natural Farming method for chickens: