It might involve trading, but will probable just require you to send money or blanks and postage. There are also print resources. Write to a couple of people and see if they'll make you a show or two. Don't expect one person to make you more than four tapes at a time. If the first person you approach says no, try someone else.
All tapers have to consider previous deals and trades first above just spinning a show for someone.
Don't get discouraged if the first person brushes you off. Make them do as little work as possible. Instead of just giving somebody a blank, give them a postage-paid, addressed envelope with blanks inside. Meet some tapers. If you want cassette copies, be prepared to ask a cassette taper.