I would say to go and check out independent local game stores. It’s not uncommon for people to run 3D printing as a side hustle, and game stores tend to have boards where people put up flyers or cards.

You want resin for 28mm characters. FDM, the alternative leaves noticeable printlines and not what you want if you’re paying for a mini.

In U.S. pricing, I’ve found these individual print people charging $1-3 USD for a human 28mm figure. Part of the idea is paying less than it costs to buy figures out of the box.