Our local bank conducts Community Shred Days a few times a year (to help combat identity theft) in which you can bring in any paper docuмents in a bag and they will shred them at no cost to the individual. They use an industrial shredder and the shredded paper is then recycled. They don't inspect the docuмents and I've used them to shred many things that don't necessarily have anything to do with identity theft.
Perhaps you have something similar in your area.