No one is making money off of small run hardware like this. The time invested in such a project will never be recuperated. This is a passion and/or university graduate project. The boards available are likely just extras from a small run they did with a prototyping service and were close to a minimum order quantity. If you order the same type of thing from somewhere like PCBway, you’ll be stuck with extras too.
I’m too busy learning AI for a project like this ATM, but I would like to build this at some point in the future.