Depending on where you live, it is possible to have wood delivered to your house for free, by landscape companies that just want to get rid of everything. You may have to take the good with the bad. Some companies just have big loads of chips to give away. This resource is very regional in nature.
Usually searching your city/metro name and wood chips will do it.
In my area someone created an app-based program called Chip Drop. Deliveries are free and you have the option to specify what you don't want (large piece, wood of particular species). Also you have the option to pay if you want to- if you find something like this, PAY. For <$5 I get cubic yards of what I want, instead of what's left over after someone else gets the goods.
Unless you're not talking about woodchips? There's often lumber of some kind available on Craigslist under the free section, in my experience. That's rarely delivered, though.
"The highest function of ecology is the understanding of consequences."
"Cultivate gratitude; hand out seed packets"
Yeah, but does being a ninja come with a dental plan? And what about this tiny ad?