On huge mountains of firewood it's usually seen around large metro areas .I recall two ,one near Toledo and one near Columbus Ohio .Both had set ups for processers ,one with two . The demand in those areas they get a lot more money per unit than for example in my area . The wood is free for all intents because these are large tree services .It's just a regional thing I think .In this area the only one that even comes close is a local hardwood mill that sells it by the dump truck full .