I think the tendency any more is for fiberglass ladders for industrial usage .OSHA has became such shitheads with wooden ladders they aren't even used any more .
About 5 6 years ago I came home with a pick up truck full of good ladders ,all wooden from a contractors liquidation auction .I bought them half a dozen at a time for usually under ten bucks .One was a 24 foot wooden extension ladder ,two bucks .I also bought three 600 foot reels of 1" three strand nylon I had under 200 bucks in .Right place ,right time .