I would suggest looking at the mechanical puzzle community.

A quick look around https://puzzleparadise.net/ will reveal many people willing to pay hundreds or thousands of dollars for bespoke homemade sequential discovery puzzles made with laser cutting, woodworking, 3D printing, CNC, mill, lathe, custom PCBs, etc.

To go further down the rabbit hole see: https://docs.google.com/spreadsheets/d/1j5V0nECn9hqUCmPmxPqi...