Reclaimed Wood is also a option, these type of companies are usually more interested in old barns and industrial buildings. Depending on the age of the home you may or may not have some good wood usable for reclaimed wood. I'm familiar with a company in Missouri, company called "Elmwood Reclaimed Timber". This company even buys antique "Tin" siding. There are other reclaimed wood companies if you think you might have some old usable wood, just Google "reclaimed wood" or "used wood".