I am sharing this wonderful thing I just learned.
First off Google, "industrial felt" in the area you live.
Visit them, ask if you can buy some scrap pieces of their 1" thick felt. They will either give it to you or charge you a couple of bucks. (My local place didn't charge me and I ended up with probably a lifetime supply of deburring felt in the form of three strips of scrap that together were about 2 sq feet).
Take it home and with a cheap razor blade type utility knife cut it into pieces suitable for deburring.
You will be a happy camper!