If you are interested in setting up your own non-profit org marketplace or know someone who does, I made an example one using free tools (https://donate.pcblues.com/) that costs me only about $10 USD per month to host the example because it is just a hosted linux VM and not Saas or software subscription based. I configured the VM myself and then "just" installed the software and configured it. It hasn't been down for ages. I only just remembered to check it. It does everything from merch and service websites to escrowed payment transactions, user reputation, etc.