Seconding this! I also keep an eye out on my local Buy Nothing group, and offer up wood scraps when I see someone looking for something I have. It helps keep folks from buying new and if I need it in the future, chances are someone else will have a replacement for me. (I also get a lot of lumber this way).
I've given away stair treads, particleboard sheets, plywood, and dimensional lumber, sometimes cut or milled to whatever dimensions they need. I even used my scraps and part of a table to build a saddle stand for someone who was looking for a suitable piece of furniture for displaying a saddle once!
